fix: #1574 previous button incorrect behaviour

[rahul-gill]

Fix for the issue #1574

[prathameshmm02]

Thanks for the PR.
I added this behaviour to support song change from earphones, e.g. I want to go back to previous song then I can just double tap my left earphone of my TWS, or maybe triple tap on wired earphones.
But if we call musicService.back(true), then if I want to go to previous song, I have to do the above skip action twice, in my case, double tapping my left earphone twice which is a pain tbh.
But this behaviour also affects notification, so if you can separate both things(Notification action and Earphone action) that would be great.

[rahul-gill]

Outside controllers can't be differentiated so we can add a preference to enable this behavior when headsets are connected

[rahul-gill]

I've added two preference in the Other settings screen to customize this behavior seperately for wired and bluetooth devices.
By default previous button will seek to start of the song
Enabling those preferences will make previous button play the previous song