Fix inconsistency in configuration override when offset

The config bounds should be offset together when the offset is set to
make the calculation reflects the truth. Also, the config bounds should
be used to calculate the final config bounds. This change fixes the
inconsistency in the calculation process.

Test: check screenHeightDp/screenWidthDp and appBounds after override
Bug: 401087186
Flag: EXEMPT bugfix
Change-Id: I75bb03420c17a8c39088e2733a3ad44c11f5e316