Use labels instead of constants for HRAM

Use explicit ldh instruction to access HRAM locations, don't rely on optimizing ld

engine/items/mart.asm

@@ -536,11 +536,11 @@ BargainShopAskPurchaseQuantity:
 	add hl, de
 	inc hl
 	ld a, [hli]
-	ld [hMoneyTemp + 2], a
+	ldh [hMoneyTemp + 2], a
 	ld a, [hl]
-	ld [hMoneyTemp + 1], a
+	ldh [hMoneyTemp + 1], a
 	xor a
-	ld [hMoneyTemp], a
+	ldh [hMoneyTemp], a
 	and a
 	ret