HDMI: Cancel standby delay runnable on one touch play

Users can press a button from the bottom sheet and switch inputs before
the runnable DelayedStandbyOnActiveSourceLostRunnable finished facing a
possible focus stealing issue.

Test: atest com.android.server.hdmi
Bug: 376496005
Flag: EXEMPT bugfix
Change-Id: I5b3cf00ac1b4ea06e79f857c1a087fd89c19e958