Changes needed for full compatibility with Emudeck

[gdeyoung]

I have been working with the developer of Emudeck and ran into a couple of issues with Bazzite. For full compatibility, the scripts that are the basis of Emudeck need a couple of packages that are not part of the Bazzite image. They are zenity and newt. I have been able to add them myself with rpmostree and overlay them. Without those two packages some of the dialog popups and other features of Emudeck error out and fail.

I would like to request adding zenity and newt to the base image for Bazzite to fix Emudeck compatibility.