Reduce externs

src/item_menu.c

@@ -476,7 +476,7 @@ void CB2_ChooseBerry(void)
     GoToBagMenu(RETURN_LOCATION_FIELD_2, BERRIES_POCKET, CB2_ReturnToFieldContinueScript);
 }
 
-void sub_81AABF0(void(*callback)(void))
+void sub_81AABF0(void (*callback)(void))
 {
     GoToBagMenu(RETURN_LOCATION_FIELD_3, BERRIES_POCKET, callback);
 }