CURA-4525 update size and margins of objects list

resources/qml/Cura.qml

@@ -383,10 +383,6 @@ UM.MainWindow
                 {
                     bottom: parent.bottom;
                     left: parent.left;
-                    leftMargin: UM.Theme.getSize("default_margin").width;
-                    rightMargin: UM.Theme.getSize("default_margin").width;
-                    topMargin: UM.Theme.getSize("default_margin").height;
-                    bottomMargin: UM.Theme.getSize("default_margin").height;
                 }
 
             }

resources/themes/cura-light/theme.json

@@ -394,7 +394,7 @@
         "jobspecs_line": [2.0, 2.0],
 
         "objects_menu_size": [20, 40],
-        "objects_menu_size_collapsed": [15, 17],
+        "objects_menu_size_collapsed": [20, 17],
         "build_plate_selection_size": [15, 5],
         "objects_menu_button": [0.3, 2.7]
     }