[gnome-boxes/close-dconf-hole] flatpak: Remove dconf permissions and set X-DConf migration path

[Felipe Borges <felipeborges src gnome org>]

commit 6cd05121408668939ec7748754eff0d69936a268
Author: Felipe Borges <felipeborges gnome org>
Date:   Wed Sep 18 17:16:55 2019 +0200

    flatpak: Remove dconf permissions and set X-DConf migration path
    
    See https://blogs.gnome.org/mclasen/2019/07/12/settings-in-a-sandbox-world/

 build-aux/flatpak/org.gnome.Boxes.json | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/build-aux/flatpak/org.gnome.Boxes.json b/build-aux/flatpak/org.gnome.Boxes.json
index 3bc13007..17013e04 100644
--- a/build-aux/flatpak/org.gnome.Boxes.json
+++ b/build-aux/flatpak/org.gnome.Boxes.json
@@ -16,11 +16,8 @@
         "--talk-name=org.freedesktop.Tracker1",
         "--talk-name=org.freedesktop.timedate1",
         "--talk-name=org.freedesktop.Accounts",
-        "--filesystem=xdg-run/dconf",
-        "--filesystem=~/.config/dconf:ro",
-        "--filesystem=home",
-        "--talk-name=ca.desrt.dconf",
-        "--env=DCONF_USER_CONFIG_DIR=.config/dconf"
+        "--metadata=X-DConf=migrate-path=/org/gnome/boxes/",
+        "--filesystem=home"
     ],
     "build-options" : {
         "cflags" : "-O2 -g",