Logplayer shortcuts only work when main window is selected

[Gama11]

This is counter-intuitive, it seems like they should also work when the PlayerControls window is focused. Then the hotkeys could also be put into the button tooltips.

[pmacalpine]

This is not an issue on linux but is an issue on mac and I assume windows. Perhaps it is a focus problem and might be related to #31 which is only an issue on linux, not on mac and windows.