Settings Fix deleting e2e room keys on xenial (#4295)

changelog.d/4295.bugfix

+Fix deleting E2E room keys when using old SQLite versions.

synapse/storage/e2e_room_keys.py

@@ -182,7 +182,7 @@ class EndToEndRoomKeyStore(SQLBaseStore):
 
         keyvalues = {
             "user_id": user_id,
-            "version": version,
+            "version": int(version),
         }
         if room_id:
             keyvalues['room_id'] = room_id