Fix double script execution when entering playtesting

`twoframedelayfix()` now gets called in `resetplayer` due to #1258, to
fix the two-frame script delay when you respawn. Unfortunately, there
seems to be some strange bug where starting playtesting in a script box
activates the script twice. While I'm not exactly sure WHY this
happens logic-wise, we can quickly squash this issue by checking if
the player is reset due to dying.

desktop_version/src/Map.cpp

@@ -791,7 +791,10 @@ void mapclass::resetplayer(const bool player_died)
     if (game.roomx != game.saverx || game.roomy != game.savery)
     {
         gotoroom(game.saverx, game.savery);
-        twoframedelayfix();
+        if (player_died)
+        {
+            twoframedelayfix();
+        }
     }
 
     int i = obj.getplayer();