event.initiator bugged for S_EVENT_MARK_* in onEvent()

[cfrag]

I've implemented some gaming functionality based on the 'mark' events that both sides (red and blue) can use to communicate with each other and (more importantly) AI. Unfortunately, in MP the event.initiator field of the S_EVENT_MARK_* events aren't set up correctly when a client uses this function. The result is that only the host can use this function (or only the side that the host resides on) when self hosting.