[gnome-robots/arnaudb/wip/gtk4: 42/45] Try to fix Flatpak build.

[Arnaud B. <arnaudb src gnome org>]

commit 54a13baa6c8f71f4f2c4095758109596c30f4204
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon May 25 22:37:06 2020 +0200

    Try to fix Flatpak build.

 build-aux/org.gnome.Robots.json | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/build-aux/org.gnome.Robots.json b/build-aux/org.gnome.Robots.json
index 84ffe08..c282b01 100644
--- a/build-aux/org.gnome.Robots.json
+++ b/build-aux/org.gnome.Robots.json
@@ -26,6 +26,7 @@
     ],
     "modules": [{
             "name": "libgnome-games-support",
+            "branch": "arnaudb/wip/gtk4",
             "modules": [{
                     "name": "libgee",
                     "config-opts": ["--enable-introspection=no"],
@@ -67,6 +68,7 @@
         },
         {
             "name": "gnome-robots",
+            "branch": "arnaudb/wip/gtk4",
             "buildsystem": "meson",
             "sources": [{
                 "type": "git",