Finish dism of item_menu

ld_script.txt

@@ -233,7 +233,6 @@ SECTIONS {
         asm/pokedex_screen.o(.text);
         src/list_menu.o(.text);
         src/item_menu.o(.text);
-        asm/item_menu.o(.text);
         src/save_location.o(.text);
         src/bag.o(.text);
         src/trainer_pokemon_sprites.o(.text);