Robert Mader 135d178d08 cleanup: Use g_clear_signal_handler() where possible
`g_clear_signal_handler()` is usually cleaner and saver than
`g_signal_handler_disconnect()`. We use it new code, lets also
adopt the existing one.

See also https://gitlab.gnome.org/GNOME/mutter/merge_requests/868
and https://gitlab.gnome.org/GNOME/mutter/merge_requests/940

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/842
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