RoomViewController: Display an error when react or unreact on event fails.
RoomViewController: Display an error when react or unreact on event fails.

vector-im/riot-ios,vector-im/riot-ios,vector-im/vector-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/vector-ios,vector-im/riot-ios,vector-im/vector-ios,vector-im/riot-ios