Merge branch 'material' into 'master'

inkhighlight bug fix

See merge request upm-packages/ui-widgets/com.unity.uiwidgets!121

Runtime/material/ink_well.cs

             },
             onHighlightChanged: onHighlightChanged,
             containedInkWell: true,
+            highlightShape: BoxShape.rectangle,
             highlightColor: highlightColor,
             splashColor: splashColor,
             splashFactory: splashFactory,