Use InputSystem_Actions.inputactions instead of XRI Default Input Actions.inputactions in Samples-STYLY

[from2001]

Starting with Unity 6, when creating a new empty project, a file named InputSystem_Actions.inputactions is automatically added to the Assets folder. Previously, we used an Editor script to automatically import the XR Interaction Toolkit’s Starter Assets and utilized the XRI Default Input Actions.inputactions file. However, going forward, it seems better to use InputSystem_Actions.inputactions instead. It may also be a good idea to update existing sample content to be based on InputSystem_Actions.inputactions.