Merge pull request #1440 from Unity-Technologies/sg/fix-for-ui-issues-on-nodes

Fixes for visual issues on nodes

com.unity.shadergraph/Editor/Resources/Styles/Controls/EnumControlView.uss

 }
 
 EnumControlView > Label {
-    width: 100;
+    width: 94;
     padding-left: 0;
     padding-right: 0;
     padding-top: 0;

com.unity.shadergraph/Editor/Resources/Styles/MaterialNodeView.uss

 }
 
 MaterialNodeView #previewFiller > #expand > #icon {
-    align-self: center;
     background-image : resource("GraphView/Nodes/PreviewExpand.png");
     width: 16;
     height: 16;
 
 #settings-button {
     width: 16;
-    align-self: center;
     justify-content: center;
     padding-left: 8;
 }