surfaceflinger: improve RenderArea needsFiltering

Compare source crop (instead of the logical render area) against
physical render area to decide whether filtering is required.  This
allows us to get rid of Layer::setFiltering.

As a result, captureLayers for Recents no longer enables filtering.
Screenshots under landscape mode no longer enables filtering.

Bug: 113041375
Test: take screenshot, rotate screen, screencap
Change-Id: Ida95fdfec3a0dde7a19adf35c91bf3d570bab6bb
Merged-In: Ida95fdfec3a0dde7a19adf35c91bf3d570bab6bb