Fix uninitialized stickmen

Funny commit message aside, they were throwing warnings in valgrind.

src/simulation/Simulation.cpp

@@ -2287,6 +2287,8 @@ void Simulation::clear_sim(void)
 	memset(gol, 0, sizeof(gol));
 	memset(portalp, 0, sizeof(portalp));
 	memset(fighters, 0, sizeof(fighters));
+	memset(&player, 0, sizeof(player));
+	memset(&player2, 0, sizeof(player2));
 	std::fill(elementCount, elementCount+PT_NUM, 0);
 	elementRecount = true;
 	fighcount = 0;