Consider setting default portal to KDE

[keenanweaver]

For the KDE flavor of Bazzite (Steam Deck iteration), sometimes the file picker will default to the GTK one instead of KDE's. I was using Ryujinx installed through Emudeck when I noticed this. How I've resolved this is adding the following to /etc/environment.

GTK_USE_PORTAL=1
XDG_CURRENT_DESKTOP=KDE
GDK_DEBUG=portals

It's probably a bit overboard and I'm unsure of any consequences, but I haven't had the issue since.