feat: add 'down' action to remappable actions and update unique IDs in input settings

scripts/UI/InputSettings.cs

@@ -12,7 +12,7 @@ public partial class InputSettings : Control
 
     // When adding new game actions, update this list to make them remappable in settings.
     private static readonly string[] RemappableActions =
-        ["left", "right", "jump", "attack", "pause", "show_marketplace"];
+        ["left", "right", "jump", "down", "attack", "pause", "show_marketplace"];
 
     private UIManager UIManager => UIManager.Instance;
     private ConfigFileHandler ConfigFileHandler => ConfigFileHandler.Instance;