Fix shuffle and other issues

[naveensingh]

Changes:

• Downgrade media3 to 1.1.1. Although 1.2.0-alpha02 has some improvements, it crashes when the app is cold starting (e.g. force-stopped) from the background.
• Fix a seek next/previous issue when shuffle mode is enabled. Originally introduced in my previous PR: Playback performance improvements #615
• Internally disable skip silence until Toggling skip silence breaks the output androidx/media#712 is resolved (this won't break seamless playback, Playback issues in 5.18.0 #604)

I have reported the media3 crash on the media3 repo so it should only be updated once androidx/media#733 is resolved.