Add abillity to get back to music player

### Is your feature request related to a problem? Please describe.
There is no possibility to get back into music player after you tapped the back button. You can reproduce this with the following steps:
1. Play a music file in nextcloud app
2. Hit "back" button to close music player
3. Try to get back into player without hitting another music file so that the current track get interrupted

### Describe the solution you'd like
It would be great to have an additional button or another possibility to get back into music player without interrupting current track.