application: Unregister from DBus when asked to.
There seems to be a typo, which keeps GNOME Maps from starting after having been closed once.
The error message looks somewhat like the following (taken from #382 (closed)).
(org.gnome.Maps:21337): Gjs-WARNING **: 12:00:21.178: JS ERROR: Gio.IOErrorEnum: Er is al een object geëxporteerd voor de interface org.gnome.Sysprof3.Profiler op /org/gtk/Profiler
vfunc_dbus_unregister@resource:///org/gnome/Maps/js/application.js:280:15