[COMBAT SURF] Make selfmute carry over map changes

[Mathew_1]

Sometimes you might forget to su a player and I personally think its good the way it is now. As instead of muting someone for your whole session, there is an expiry at the end of each map in case you forget.
Plus its not complicated to just re-write the self mute and mute the player for the rest of that map.
Good suggestion, I have thought about it before thought, but I just thought it could do more right while it still unmutes at the end of maps.
Sorry, but -1.