[gnome-boxes] Revert "flatpak: Remove dconf permissions and set X-DConf migration path"

[Felipe Borges <felipeborges src gnome org>]

commit 0538c3604bdafa8fff6645c50cdb62f74fb66e17
Author: Felipe Borges <felipeborges gnome org>
Date:   Mon Sep 23 16:43:07 2019 +0200

    Revert "flatpak: Remove dconf permissions and set X-DConf migration path"
    
    This reverts commit 7375cc0e6619a3f54cd737982b31742f9dbea740.
    
    Until something like https://github.com/flatpak/xdg-desktop-portal/pull/367
    is available, we will need to kep the dconf hole around.
    
    Boxes needs to access "org.gnome.desktop.input-sources" to figure
    out what's the keyboard layout and propagate that to the guest while
    performing express-installs. This was introduced in 06bcf19.

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