sway: Fix import of environment variables

See https://wiki.archlinux.org/title/Sway#Manage_Sway-specific_daemons_with_systemd.

environment/.config/environment.d/envvars.conf

@@ -1,2 +1,3 @@
 XDG_CURRENT_DESKTOP="sway"
 MOZ_ENABLE_WAYLAND=1
+GTK_USE_PORTAL=0

sway/.config/sway/config

@@ -270,4 +270,5 @@ assign [app_id="gst-launch-1.0"] 4
 # Call kanshi to automatically configure connected display outputs
 # exec kanshi
 # Load environment variables
-exec "systemctl --user import-environment"
+exec systemctl --user import-environment XDG_CURRENT_DESKTOP MOZ_ENABLE_WAYLAND GTK_USE_PORTAL
+include /etc/sway/config.d/*