Fix hotspot positioning of trashcan in mutator dialog.
Fix hotspot positioning of trashcan in mutator dialog.

git-svn-id: 5890ca18e72b21e319770deb79a4bf5251fa1316@39 564c4054-8e92-c1d3-c2f1-8eb89f0f2216

derrell/Blockly,derrell/Blockly