Default Input Action Asset creates unsaved changes when clicking on Button actions

Steps to reproduce:

1. Open a Unity Project
2. Ensure that the Input System package is installed
3. Create a new Empty GameObject via GameObject > Create Empty
4. Select the new GameObject
5. Add a 'Player Input' component to the GameObject
6. On the Player Input component, click 'Create Actions' and create a default Input Actions Asset
7. Double click on the new Input Actions Asset to open it
8. Ensure 'Auto-Save' is not enabled
9. Click on any Action in either the Player or UI Action map that has an 'Action Type' of Button

Actual results: The Input Asset gets unsaved changes. 

By saving and then checking GitHub, it looks like the changes are from converting Button to an empty string for each Button Action you click on from the default asset: 

Expected results: The Input Asset does not get unsaved changes

Reproducible with versions: 1.11.2, 1.8.0

Not reproducible with versions: 1.8.0-pre.2

Can't test with versions: 7000

Tested on (OS): Windows 11

Notes: 

• This occurs both on a default input action asset created with some project templates, or with creating a default input action asset via a Player Input component.
• This doesn't affect Input Action Assets that the user creates from scratch, or if they add their own Button Action Type to an Input Action Asset.