[MXTools] Handle event type to enum to string for kMXEventTypeStringRoomTombStone.
[MXTools] Handle event type to enum to string for kMXEventTypeStringRoomTombStone.

matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk