Hearthstone pauses background audio on mobile

[Skizzy-11719]

For those who are not aware:

@GnomeSayin-11972

The team is aware that sounds from other apps can no longer be played while playing on mobile. This was an intentional change made as a temporary solution to a bug with background sounds causing crashes. A permanent solution to the bug that also allows for other apps to play sounds is scheduled for a future patch.