Dismiss PIP window when PIP is disabled from settings.

The app ops call comes in on a binder thread so we need to post dismissPip() to the main thread.

Bug: 73625696
Test: atest
CtsActivityManagerDeviceTestCases:ActivityManagerPinnedStackTests

Change-Id: I365947934155d0d29ac67ebedc0b35b6d377cb84
1 file changed