Bug 1631462 - Allow Wayland to be used in the Snap. r=mtabara

Differential Revision: https://phabricator.services.mozilla.com/D101375

taskcluster/docker/firefox-snap/firefox.snapcraft.yaml.in

@@ -13,7 +13,6 @@ apps:
     desktop: distribution/firefox.desktop
     extensions: [gnome-3-34]
     environment:
-      DISABLE_WAYLAND: 1
       HOME: "$SNAP_USER_COMMON"
       GTK_USE_PORTAL: 1
     slots: