Fix volume reset issue in exoPlayer

[justsml]

Fix max volume issue in exoPlayer when gaining focus.

See issue #2153

Credit: #2153 (comment)

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[hueniverse]

@freeboub Can you do a quick review?

[freeboub]

Yes this is Great 👍

[MitoMonkey]

The fix works and I see it was merged in May 21, but it does not seem to be included in v5.2.x as can be seen here: https://github.com/react-native-video/react-native-video/blob/ce03223f94771153962285042f28bed8881d633c/android-exoplayer/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java#L1243

May I ask why?

[justsml]

It might have needed a fallback check to see if the audioVolume == 0.f then reset it to 1.f.
Not sure.

[justsml]

Oh, never mind, it appears lined up for the newest v6.