home: Handle the super key

Merged Alistair Francis requested to merge alistair23/phosh:alistair/super-key into main

Since Phoc allows passing the super key (see MR) we can subscribe to it and use the super key to unfold the home. This is similar to how the key works on Gnome.

Note that on versions of Phoc that don't expose the super key, this will just generate a warning as Phoc rejects the binding.

Works-with: phoc!447 (merged) Fixes: #563 (closed) Signed-off-by: Alistair Francis alistair@alistair23.me

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