Gallery2: invalidate album view even only size changed

After deleting the pictures, it didn't request to
update the view. so the left pictures can not be
updated and displayed instantly.

Invalidate album view even only size changed to
make it shown correctly.

CRs-Fixed: 393995

Change-Id: I9924edf3a1d0e46d045425b9d078758e8cb50685
Merge "Gallery2: invalidate album view even only size changed" into du44