appIconMenu: Disable sourceActor key events

Florian Müllner requested to merge wip/fmuellner/fix-98 into main

Enter/space are already taken over by the app icon to activate the app, and arrow keys interfere with keyboard navigation where icons are arranged in a grid (namely the app picker).

Also as app icons only create the menu when it is first needed, the shortcuts only starts to work once a menu has been opened, which is rather inconsistent and confusing.

It is better to simply disable the key handling altogether for the app icon menu.

Fixes #98

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