Tweak P_ZMovement from r3617: looks like it was exploding missles a bit early, some code duplication, sould fix a few demo desyncs at least | Only launch a mushroom cloud serverside

git-svn-id: http://odamex.net/svn/root/trunk@3724 b0bcef46-2027-0410-bd56-ab726e9a1d04