Remove UBFIX related to task destruction

src/battle_transition.c

@@ -4762,10 +4762,8 @@ static bool8 FrontierSquaresScroll_End(struct Task *task)
     BlendPalettes(PALETTES_ALL, 16, RGB_BLACK);
 
     DestroyTask(FindTaskIdByFunc(task->func));
+    task->tState++; // Changing value of a destroyed task
 
-#ifndef UBFIX
-    task->tState++; // UB: changing value of a destroyed task
-#endif
     return FALSE;
 }