Add feature_bridge_state to config

Author: Half-Shot

riot.im/develop/config.json

@@ -22,7 +22,8 @@
         "feature_dm_verification": "labs",
         "feature_cross_signing": "labs",
         "feature_event_indexing": "labs",
-        "feature_ftue_dms": "labs"
+        "feature_ftue_dms": "labs",
+        "feature_bridge_state": "labs"
     },
     "welcomeUserId": "@riot-bot:matrix.org",
     "piwik": {