Reverse previous/next quickslot due to vertical alignment

scenes/ui/quick_slots.gd

@@ -65,10 +65,10 @@ func select_quick_slot(slot_index: int) -> void:
 	InventoryManager.quick_slot_item_changed.emit(get_selected_item())
 
 func select_previous_item() -> void:
-	select_quick_slot(_selected_item - 1)
+	select_quick_slot(_selected_item + 1)
 
 func select_next_item() -> void:
-	select_quick_slot(_selected_item + 1)
+	select_quick_slot(_selected_item - 1)
 
 func update_highlighted_slot() -> void:
 	var previous_slot: Panel = slots_container.get_child(_previous_selected_item)