Fix VectorDrawable dirty flag logic

Pass VD staging dirty flag value to the render thread dirty flag.
This is fixing animation on growing VD bounds, which looked bad
because cache was not refreshed and scaling it up 100 times did
not look good.

Test: Ran GoogleCamera app and HWUI unit tests.
Bug: 65534766
Change-Id: Ie83cbb6839c772556340b4ec526ba3699fc84255