Expose ~/config/gtk-4.0 with read only permissions for all flatpaks

[n3thshan]

Background

KDE uses its own gtk 4 configs to make gtk4 apps look more consistent with plasma. One issue with exposing them globally with read only is that Kate (or other text editors) may not be able to write/edit the file unless they are explicitly given write access to. The following screenshot best explains this.

Before	After

Notice how the corners are less rounded just like normal KDE apps when the gtk-4.0 is exposed! It is a minor cosmetic change, yet impacts the intuitiveness of the desktop IMO. I also believe by doing so, it makes the accent color of gtk 4 apps the same (or atleast somewhat) as Plasma's. Hope this would be considered.

[RealVishy]

One issue with exposing them globally with read only is that Kate (or other text editors) may not be able to write/edit the file unless they are explicitly given write access to.

Do they need write access for anything? Does it provide any extra functionality.

[n3thshan]

@RealVishy the only ones i can think of would be to use custom gtk4 themes and/or change the accent colour to a custom one via a text editor. But then again since this is KDE i doubt most users would do that.