run P_RunShadows also in preticker

so the game wont crash randomly at mapload sometimes

src/p_tick.c

@@ -896,6 +896,8 @@ void P_PreTicker(INT32 frames)
 		//P_RunShields();
 		P_RunOverlays();
 		
+		P_RunShadows();
+
 		P_UpdateSpecials();
 		P_RespawnSpecials();