Remove references to the toolbox plugin from the themes.json

Some other components were (incorrectly) using these theme variables.
Replaced them by another theme variable with the same value.

CURA 8588

plugins/DigitalLibrary/resources/qml/ProjectSummaryCard.qml

@@ -44,7 +44,7 @@ Cura.RoundedRectangle
         {
             id: projectImage
             anchors.verticalCenter: parent.verticalCenter
-            width: UM.Theme.getSize("toolbox_thumbnail_small").width
+            width: UM.Theme.getSize("card_icon").width
             height: Math.round(width * 3/4)
             sourceSize.width: width
             sourceSize.height: height

plugins/DigitalLibrary/resources/qml/SelectProjectPage.qml

@@ -201,7 +201,7 @@ Item
                 LoadMoreProjectsCard
                 {
                     id: loadMoreProjectsCard
-                    height: UM.Theme.getSize("toolbox_thumbnail_small").height
+                    height: UM.Theme.getSize("card_icon").height
                     width: parent.width
                     visible: manager.digitalFactoryProjectModel.count > 0
                     hasMoreProjectsToLoad: manager.hasMoreProjectsToLoad

resources/themes/cura-dark/theme.json

@@ -176,10 +176,6 @@
 
         "quality_slider_available": [255, 255, 255, 255],
 
-        "toolbox_header_button_text_active": [255, 255, 255, 255],
-        "toolbox_header_button_text_inactive": [128, 128, 128, 255],
-        "toolbox_premium_packages_background": [57, 57, 57, 255],
-
         "monitor_printer_family_tag": [86, 86, 106, 255],
         "monitor_text_disabled": [102, 102, 102, 255],
         "monitor_icon_primary": [229, 229, 229, 255],

resources/themes/cura-light/styles.qml

@@ -602,62 +602,6 @@ QtObject
         }
     }
 
-    property Component toolbox_action_button: Component
-    {
-        ButtonStyle
-        {
-            background: Rectangle
-            {
-                implicitWidth: UM.Theme.getSize("toolbox_action_button").width
-                implicitHeight: UM.Theme.getSize("toolbox_action_button").height
-                color:
-                {
-                    if (control.installed)
-                    {
-                        return UM.Theme.getColor("action_button_disabled");
-                    }
-                    else
-                    {
-                        if (control.hovered)
-                        {
-                            return UM.Theme.getColor("primary_hover");
-                        }
-                        else
-                        {
-                            return UM.Theme.getColor("primary");
-                        }
-                    }
-
-                }
-            }
-            label: Label
-            {
-                text: control.text
-                color:
-                {
-                    if (control.installed)
-                    {
-                        return UM.Theme.getColor("action_button_disabled_text");
-                    }
-                    else
-                    {
-                        if (control.hovered)
-                        {
-                            return UM.Theme.getColor("button_text_hover");
-                        }
-                        else
-                        {
-                            return UM.Theme.getColor("button_text");
-                        }
-                    }
-                }
-                verticalAlignment: Text.AlignVCenter
-                horizontalAlignment: Text.AlignHCenter
-                font: UM.Theme.getFont("default_bold")
-            }
-        }
-    }
-
     property Component monitor_button_style: Component
     {
         ButtonStyle

resources/themes/cura-light/theme.json

@@ -428,9 +428,6 @@
         "printer_config_matched": [50, 130, 255, 255],
         "printer_config_mismatch": [127, 127, 127, 255],
 
-        "toolbox_header_button_text_inactive": [0, 0, 0, 255],
-        "toolbox_premium_packages_background": [240, 240, 240, 255],
-
         "favorites_header_bar": [245, 245, 245, 255],
         "favorites_header_hover": [245, 245, 245, 255],
         "favorites_header_text": [31, 36, 39, 255],
@@ -644,24 +641,6 @@
         "build_plate_selection_size": [15, 5],
         "objects_menu_button": [0.3, 2.7],
 
-        "toolbox_thumbnail_small": [6.0, 6.0],
-        "toolbox_thumbnail_medium": [8.0, 8.0],
-        "toolbox_thumbnail_large": [12.0, 10.0],
-        "toolbox_footer": [1.0, 4.5],
-        "toolbox_footer_button": [8.0, 2.5],
-        "toolbox_header_tab": [12.0, 4.0],
-        "toolbox_detail_header": [1.0, 14.0],
-        "toolbox_back_column": [6.0, 1.0],
-        "toolbox_back_button": [6.0, 2.0],
-        "toolbox_installed_tile": [1.0, 8.0],
-        "toolbox_property_label": [1.0, 2.0],
-        "toolbox_heading_label": [1.0, 3.8],
-        "toolbox_header": [1.0, 4.0],
-        "toolbox_header_highlight": [0.25, 0.25],
-        "toolbox_chart_row": [1.0, 2.0],
-        "toolbox_action_button": [8.0, 2.5],
-        "toolbox_loader": [2.0, 2.0],
-
         "notification_icon": [1.5, 1.5],
 
         "avatar_image": [6.8, 6.8],