xournalpp: missing adwaita-icon-theme dependency

Reported on IRC:

10:36 Just a quick nudge to say that xournalpp package is broken, it's missing a dependency on adwaita-icon-theme and won't start otherwise apparently

10:37 Gtk:ERROR:../gtk/gtkiconhelper.c:495:ensure_surface_for_gicon: assertion failed (error == NULL): Icon 'image-missing' not present in theme Adwaita (gtk-icon-theme-error-quark, 0)

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