Fix item losing its parent model when filtered out

TODO.md

@@ -1,8 +1,6 @@
 # TODO
 
 - fix python getting stuck when loading large room
-- fix accounts in room list not getting their profile updated if mirage starts
-  with a filter
 - fix lag when clicking accounts in the AccountBar with a very long room list
 
 - fix: on startup, if a room's last event is a membership change,

src/backend/models/model.py

@@ -135,7 +135,7 @@ class Model(MutableMapping):
         with self._write_lock:
             item = self._data[key]
 
-            if self.sync_id:
+            if self.sync_id and self.take_items_ownership:
                 item.parent_model = None
 
             del self._data[key]