gamelobby: call lobby.Update with lock

Update iterates the player map -> needs lock

gamelobby.go

@@ -50,9 +50,9 @@ func (gl *GameLobby) Register(glp *Player) {
 	}
 	gl.players[glp.name] = p
 	gl.playerOrder = append(gl.playerOrder, p.name)
-	gl.Unlock()
 	go gl.Loop(p)
 	gl.Update()
+	gl.Unlock()
 }
 
 func (gl *GameLobby) Unregister(name string) {