Don't wait for paused audio to drain. Fixes #11730.

The problem is that MythPlayer::AVSync() might pause audio while
dropping a frame, and if this happens during the EOF A/V draining
period, it could wait forever for the audio to drain.

Alternatively or in addition, AVSync() could check that
GetEof()!=kEofStateDelayed before pausing audio.  Thanks to Mark
Spieth for the analysis.

mythtv/libs/libmythtv/mythplayer.cpp

@@ -2957,6 +2957,7 @@ void MythPlayer::EventLoop(void)
             videoOutput && videoOutput->ValidVideoFrames() < 1;
         bool audioDrained =
             !audio.GetAudioOutput() ||
+            audio.IsPaused() ||
             audio.GetAudioOutput()->GetAudioBufferedTime() < 100;
         if (eof != kEofStateDelayed || (videoDrained && audioDrained))
         {