Fix reset to formula button and use new icon

CURA-5407

resources/qml/Settings/SettingItem.qml

@@ -264,7 +264,7 @@ Item {
                     {
                         // Another special case. The setting that is overriden is only 1 instance container deeper,
                         // so we can remove it.
-                        propertyProvider.removeFromContainer(0)
+                        propertyProvider.removeFromContainer(last_entry - 1)
                     }
                     else
                     {
@@ -281,7 +281,7 @@ Item {
                 color: UM.Theme.getColor("setting_control_button")
                 hoverColor: UM.Theme.getColor("setting_control_button_hover")
 
-                iconSource: UM.Theme.getIcon("notice");
+                iconSource: UM.Theme.getIcon("formula");
 
                 onEntered: { hoverTimer.stop(); base.showTooltip(catalog.i18nc("@label", "This setting is normally calculated, but it currently has an absolute value set.\n\nClick to restore the calculated value.")) }
                 onExited: base.showTooltip(base.tooltipText);

resources/themes/cura-light/icons/formula.svg

@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="15"
+   height="15"
+   viewBox="0 0 15 15"
+   version="1.1"
+   id="svg3763"
+   sodipodi:docname="formula.svg"
+   inkscape:version="0.92.3 (2405546, 2018-03-11)">
+  <metadata
+     id="metadata3769">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs3767" />
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1920"
+     inkscape:window-height="1176"
+     id="namedview3765"
+     showgrid="false"
+     inkscape:zoom="40.8"
+     inkscape:cx="7.5"
+     inkscape:cy="7.9433209"
+     inkscape:window-x="1920"
+     inkscape:window-y="360"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg3763" />
+  <path
+     d="M 7.5371094 0.037109375 A 7.5 7.5 0 0 0 0.037109375 7.5371094 A 7.5 7.5 0 0 0 7.5371094 15.037109 A 7.5 7.5 0 0 0 15.037109 7.5371094 A 7.5 7.5 0 0 0 7.5371094 0.037109375 z M 7.8867188 1.9335938 L 9.0195312 1.9335938 L 8.8105469 2.9375 L 7.6660156 2.9375 C 7.2319879 2.9375 6.9144965 3.0236545 6.7148438 3.1972656 C 6.515191 3.3708767 6.3719618 3.6833767 6.2851562 4.1347656 L 6.1542969 4.7734375 L 8.1347656 4.7734375 L 7.9511719 5.6972656 L 5.9726562 5.6972656 L 4.6972656 12.064453 L 3.4980469 12.064453 L 4.7753906 5.6972656 L 3.6289062 5.6972656 L 3.8105469 4.7734375 L 4.9570312 4.7734375 L 5.0605469 4.265625 C 5.2254774 3.4496528 5.5299479 2.8587239 5.9726562 2.4941406 C 6.4240451 2.1208767 7.062066 1.9335938 7.8867188 1.9335938 z M 7.1699219 8.3632812 L 8.0175781 8.3632812 L 8.8691406 9.921875 L 10.337891 8.3632812 L 11.185547 8.3632812 L 9.1777344 10.492188 L 10.392578 12.738281 L 9.5449219 12.738281 L 8.6152344 11.019531 L 6.9980469 12.738281 L 6.1503906 12.738281 L 8.3105469 10.449219 L 7.1699219 8.3632812 z "
+     id="path3773" />
+</svg>