Set correct bounds when offset and expanded

This bug occured when offset during pip window expanding animation.
curBounds value is still not expand bounds values, fix it by reset
curBounds if it should be expanded status.

Fix: 154647477
Test: Move pip widnow near and above IME then touch it.
Change-Id: I3d0215b96643c7d33d8d922d41ac12cd6291270e