fix gvfs for steam flatpak

configuration.nix

@@ -108,6 +108,8 @@ openssl.out
 sbcl
 
 guix
+
+	gnome.gvfs
     # cmake
     # harfbuzz
     # freetype
@@ -142,6 +144,7 @@ guix
   xdg.portal.config.common.default = "*";
   security.polkit.enable = true;
   services.flatpak.enable = true;
+  # xdg.portal.extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
 
   # Some programs need SUID wrappers, can be configured further or are
   # started in user sessions.