API：backgroundAudioManager

微信版本：8.0.6

基础库版本：2.17.0

手机型号：oppo find x2 pro

表现：通过背景音乐播放，当一个背景音乐播放结束时，切换到后台，这个时候后台再设置 src 就会报错，报错信息如下："setBackgroundAudioState:fail: jsapi has "setBackgroundAudioState:fail: jsapi has no permission, event=setBackgroundAudioState, runningState=background, permissionMsg=permission ok, detail=jsapi permission required playing audio but current not playing audio in background state