tidy up new toolbar item

Hi Javon,

  the new toolbar code broke RB2.99 and later  - so I fixed that for you.  Basically, you can't have toolbar menu items in RB2.99 and later since there is no-longer a ui-manager to poke stuff into.

Also I felt that the "Play Random Album" caused the toolbar button to be a bit too big compared to the other buttons - so I hope you dont mind, I've truncated the label so that the button size is reduced to something more reason.

As before - I've tested this on RB2.96 and RB3.0 and all looks ok.