Fix lvl3 door appearing wrong when opened by other players

Source/objects.cpp

@@ -3915,9 +3915,9 @@ void SyncOpL3Door(int pnum, int cmd, int i)
 		do_sync = TRUE;
 	if (do_sync) {
 		if (object[i]._otype == OBJ_L3LDOOR)
-			OperateL2LDoor(-1, i, FALSE);
+			OperateL3LDoor(-1, i, FALSE);
 		if (object[i]._otype == OBJ_L3RDOOR)
-			OperateL2RDoor(-1, i, FALSE);
+			OperateL3RDoor(-1, i, FALSE);
 	}
 }