flatpak: update permissions

GTK 4 apps want OpenGL access.

Also, we don't need dconf access anymore. And we don't need X11 access
when running under Wayland.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-chess/-/merge_requests/46>

org.gnome.Chess.json

@@ -8,13 +8,11 @@
     "tags": ["nightly"],
     "desktop-file-name-prefix": "(Nightly) ",
     "finish-args": [
-        /* X11 + XShm access */
-        "--share=ipc", "--socket=x11",
-        /* Wayland access */
+        "--share=ipc",
+        "--socket=fallback-x11",
         "--socket=wayland",
-        /* dconf */
-        "--filesystem=xdg-run/dconf", "--filesystem=~/.config/dconf:ro",
-        "--talk-name=ca.desrt.dconf", "--env=DCONF_USER_CONFIG_DIR=.config/dconf"
+        "--device=dri",
+         "--metadata=X-DConf=migrate-path=/org/gnome/Chess/"
     ],
     "build-options": {
         "prepend-path": "/usr/lib/sdk/vala-nightly/bin/",