assembly view: use official room ordering here, too

src/plainui/views/assemblies.py

@@ -67,7 +67,7 @@ class AssemblyView(ConferenceRequiredMixin, DetailView):
             Prefetch(
                 'rooms',
                 to_attr='public_rooms',
-                queryset=Room.objects.conference_accessible(self.conf).order_by('name'),
+                queryset=Room.objects.conference_accessible(self.conf).order_by('official_room_order', 'name'),
             ),
             Prefetch(
                 'tags',