Slight UI improvement

[simonmeulenbeek]

Change: single clicking on the small player now makes it full screen.

Reason: It annoyed me that you had to click on the player icon in the sidebar to return to fullscreen from the mini player. Looking through the code I figured out I needed to doubleclick, I never thought of that! A bit dumb I know. I think this change makes it a bit more intuitive.

[ahjolinna]

I do prefer the "double click" because if it was just "single click" then it increases the possibility that you will easily just miss click which becomes more annoying, plus "double click" is also better for touch screen also

[alamminsalo]

I think dblclick is the better option because it prevents accidental clicks better