Update PIP dismiss to use DismissView

All the values / things being done in PIP are exactly the same as what
DismissView does. This change updates PIP to use DismissView directly
so PIP will always pick up visual changes to dismiss without having
to copy them over manually.

Test: manual - have a PIP, drag it around and observe dismiss, drag
               PIP to dismiss, observe
Bug: 217211205
Change-Id: I430df28bdb7980ff5a0316c4aab728fe54e95e6b