[Players] Avoid jumping volume to maximum after trickplay
For players that control volume, if the speed changes (e.g. with ff/rew) the volume gets reset to maximum.
This change sets it back to current value, although I question why it is being changed at all.
Do any players require muting during trickplay?
Merge pull request #3490 from popcornmix/avoid_max_vol_after_seek

[Players] Avoid jumping volume to maximum after trickplay