Gallery2: Fix crop after straighten bug

During straighten and crop, there will be a crop Rect exits, the
comparement of these two Rect is not perfect, so the two rect is
considered to be different, and the Representation is wrong.

Set the origenal Rect equals to representation.

CRs-Fixed: 766877

Change-Id: Id76dfef360cdaff109cdce505cb5f289691645c6