Don't peek when creating a room

This causes a race between receiving the room when starting to peek and receiving the room from joining it - https://github.com/vector-im/riot-web/issues/4330, https://github.com/matrix-org/riot-web-rageshakes/issues/196

src/createRoom.js

@@ -100,6 +100,7 @@ function createRoom(opts) {
             dis.dispatch({
                 action: 'view_room',
                 room_id: roomId,
+                should_peek: false,
             });
         }
         return roomId;