Gallery2: fix display abnormal of photo editor.

1. fix CompareButton's position changed when switch filter.
2. fix editor image's position changed when switch filter.
3. modify exit dialog function.
4. set editor's actionbar not translucent.

Change-Id: I5e8445d91a0215d93cf19c7ac44fe98ff2b5fae6
CRs-Fixed: 995996