remove explicit memcpy and add HEAP_SIZE constant

src/reset_save_heap.c

@@ -23,10 +23,8 @@ void sub_81700F8(void)
     ResetSaveCounters();
     sub_81534D0(0);
     if (gSaveFileStatus == 0 || gSaveFileStatus == 2)
-    {
         Sav2_ClearSetDefault();
-    }
     SetPokemonCryStereo(gSaveBlock2Ptr->optionsSound);
-    InitHeap(gHeap, 0x1c000);
+    InitHeap(gHeap, HEAP_SIZE);
     SetMainCallback2(sub_8086230);
 }