Update the activity current config only if it is reported

The current configuration in the client activity could be
updated via the other flow (from ViewRootImpl). So, it is
possible that the client activity configuration is different
from the last reported configuration that cached in the system.

If the configuration changed again in that case, the
ActivityConfigurationChangeItem could end up without reporting
Activity#onConfigurationChanged if the differences between
the new configuration and the current client activity
configuration contains the configuration changes that the
activity cannot handle.

Update the activity current config only when reported, so
the configuration differences can be correctly evaluated from
the new configuration and the configuration last reported.

Bug: 231312158
Test: repro steps on the bug
Test: atest ActivityThreadClientTest
Change-Id: Ifa27d222bb0905053cf12e08c423bf7bfad904cd