Fix spurious "Your server isn't responding to some requests" (#11306)

When changing room notification settings
This happened due to a race condition between adding a push rule and enabling it, the latter being superfluous given the spec says

> When creating push rules, they MUST be enabled by default.

src/RoomNotifs.ts

@@ -152,8 +152,6 @@ function setRoomNotifsStateUnmuted(cli: MatrixClient, roomId: string, newState:
                 actions: [PushRuleActionName.DontNotify],
             }),
         );
-        // https://matrix.org/jira/browse/SPEC-400
-        promises.push(cli.setPushRuleEnabled("global", PushRuleKind.RoomSpecific, roomId, true));
     } else if (newState === RoomNotifState.AllMessagesLoud) {
         promises.push(
             cli.addPushRule("global", PushRuleKind.RoomSpecific, roomId, {
@@ -166,8 +164,6 @@ function setRoomNotifsStateUnmuted(cli: MatrixClient, roomId: string, newState:
                 ],
             }),
         );
-        // https://matrix.org/jira/browse/SPEC-400
-        promises.push(cli.setPushRuleEnabled("global", PushRuleKind.RoomSpecific, roomId, true));
     }
 
     return Promise.all(promises);