Never hide the source/stream/parent volume bar in the player view

[SteveMicroNova]

Currently the volume bar that shows on the player view runs through a check to see if there is only one group connected, and if yes it shows that group as the parent bar instead of the bar that has the same functionality as the bars on the home screen do.

This was a value add back when those bars did the same thing, now there's no good way to change volumes in a relativistic manner if you want the groups volumes to not be synced to the same point

To maintain the added value while also restoring relativistic vol change functionality, I'd suggest potentially just having the sole group be pre-expanded to provide the same minimal click/tap per operation rate that the volume bar check was added for