[gnome-builder] flatpak: set X-DConf migration path

[Christian Hergert <chergert src gnome org>]

commit 3c783021102a9fc528f3c7ea90cf360ee164bd49
Author: Christian Hergert <chergert redhat com>
Date:   Mon May 6 10:05:44 2019 -0700

    flatpak: set X-DConf migration path
    
    If/when we have gsettings migration into the sandboxed form, we
    want to migrate paths from the previous dconf settings.
    
    This is a 1.3.x flatpak feature.

 build-aux/flatpak/org.gnome.Builder.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/build-aux/flatpak/org.gnome.Builder.json b/build-aux/flatpak/org.gnome.Builder.json
index 178f83f3b..f1b8c079a 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -37,6 +37,7 @@
         "--filesystem=~/.local/share/flatpak",
         "--filesystem=xdg-data/meson",
         "--filesystem=/var/lib/flatpak",
+        "--metadata=X-DConf=migrate-path=/org/gnome/builder/",
         "--env=G_SLICE=always-malloc"
     ],
     "x-run-args" : [