fix(iOS): Allow audio mixing if one of the video views require it #4559
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Summary
After the PR #4466, where the AudioSessionManager was introduced, background video audio would be stopped by external apps i.e. Spotify even if mixWithOthers is set to "mix".
Motivation
The video audio should not be paused by external apps if mixWithOthers is set to "mix" or "duck".
Changes
Check if one of the video views has mixWithOthers set to "mix" or "duck" and allow audio mixing.
Test plan
Start playing react-native-video, put the react-native-video app to background, open Spotify, start playing music. Spotify music should mix with react-native-video.