[gnome-control-center] flatpak: Use the 0.0 branch of libhandy instead of master

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 999962fbfcbda3aa1b583bacb91450b45afc04d7
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Mar 6 12:10:48 2020 +0100

    flatpak: Use the 0.0 branch of libhandy instead of master
    
    This is the one prviding libhandy 0.0 as master provides the WIP
    libhandy 1. HEnce, this avoids building libhandy as a submodule.

 build-aux/flatpak/org.gnome.Settings.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/build-aux/flatpak/org.gnome.Settings.json b/build-aux/flatpak/org.gnome.Settings.json
index ce531d9df..a3603715d 100644
--- a/build-aux/flatpak/org.gnome.Settings.json
+++ b/build-aux/flatpak/org.gnome.Settings.json
@@ -587,7 +587,8 @@
             "sources" : [
                 {
                     "type" : "git",
-                    "url" : "https://source.puri.sm/Librem5/libhandy.git";
+                    "url" : "https://source.puri.sm/Librem5/libhandy.git";,
+                    "branch" : "libhandy-0-0"
                 }
             ]
         },