fix: explicitly assign problematic portal interfaces (that fallback t…

…o gnome) to regolith portal

Portals may not follow the expected ordering as per [this](flatpak/xdg-desktop-portal#1111) issue.

This causes some of the interfaces that are made available by other backend (like gtk or wlr) to get assigned to the no-op
implementations of the xdp-regolith backend.

This PR explicitly assigns only the problematic interfaces, i.e. the ones that get assigned to xdp-gnome, to the regolith backend.

data/regolith-portals.conf

@@ -1,3 +1,10 @@
 [preferred] 
 default=gtk;regolith;
 org.freedesktop.impl.portal.Secret=gnome-keyring
+
+org.freedesktop.impl.portal.Background=regolith
+org.freedesktop.impl.portal.Clipboard=regolith
+org.freedesktop.impl.portal.InputCapture=regolith
+org.freedesktop.impl.portal.RemoteDesktop=regolith
+org.freedesktop.impl.portal.Settings=regolith
+org.freedesktop.impl.portal.Wallpaper=regolith

data/regolith-wayland-portals.conf

@@ -1,3 +1,10 @@
 [preferred] 
-default=wlr;gtk;regolith;
+default=wlr;gtk;
 org.freedesktop.impl.portal.Secret=gnome-keyring
+
+org.freedesktop.impl.portal.Background=regolith
+org.freedesktop.impl.portal.Clipboard=regolith
+org.freedesktop.impl.portal.InputCapture=regolith
+org.freedesktop.impl.portal.RemoteDesktop=regolith
+org.freedesktop.impl.portal.Settings=regolith
+org.freedesktop.impl.portal.Wallpaper=regolith