Revert "SurfaceFlinger: debug layer bounds inset"

Revert the debug patch as layer seems to ve valid.
Instead validate the input to avoid an overflow.

Bug: 137560795
Bug: 139945549
Test: boot

This reverts commit 38172ad8.
Merged-in: Ia1687bca84361dc8f665b9c0f893b8f40c5362e1
Change-Id: I07905d1e69b8c0a7dd23e620252fc7c133ed666e
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>