[55/n] Rename confusing variable name

The name resolvedOrientation is ambiguous because it could
be misinterpreted as the final orientation after considering
all factors, including those in resolveOverrideConfiguration().

However, at this point in the code, it only reflects the
immediate override state, which can be further modified by
subclasses overriding getOverrideOrientation().

Therefore, actualOverrideOrientation is a more accurate name
as it represents the actual override orientation that will be
used later.

Flag: EXEMPT Small fix
Bug: 360865550
Test: m

Change-Id: Ief309362de7743d0cc7bc86678c5b68ad29dc7ef