Use labels instead of constants for HRAM

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

engine/menus/save.asm

@@ -325,10 +325,10 @@ FindStackTop:
 SavingDontTurnOffThePower:
 	; Prevent joypad interrupts
 	xor a
-	ld [hJoypadReleased], a
-	ld [hJoypadPressed], a
-	ld [hJoypadSum], a
-	ld [hJoypadDown], a
+	ldh [hJoypadReleased], a
+	ldh [hJoypadPressed], a
+	ldh [hJoypadSum], a
+	ldh [hJoypadDown], a
 	; Save the text speed setting to the stack
 	ld a, [wOptions]
 	push af