media-keys: Remove screenshot key handling

In gnome-shell!1954 (merged), gnome-shell begins to handle the screenshot keys itself. This is required to easily provide same-frame response to pressing a screenshot key.

I don't think it makes much sense to transfer any of the old bindings because:

  • half of them are gone (screenshots are saved to file and clipboard at the same time)
  • we want the screenshot UI on PrtSc, which is currently taken by "Take a screenshot", which means that if we transfer that binding nobody will have the screenshot UI bound

EDIT: The g-c-c update for the configuration change is in gnome-control-center!1075 (merged)

Edited by Benjamin Berg

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