Remove entry from mLastReportedWindowingMode on destroy

Bug: 166456665
Test: atest ActivityLifecyclePipTests \
            ActivityLifecycleSplitScreenTests \
            ActivityLifecycleTopResumedStateTests \
            PinnedStackTests\
            SplitScreenTests \
            ActivityLifecycleKeyguardTests
Change-Id: If2cf664bdb62ac3082c02d2c6c1ad74b10761f62
1 file changed