[EventFormatter] Update room create event type processing when content has room predecessor info.
[EventFormatter] Update room create event type processing when content has room predecessor info.

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