[baobab] flatpak: Use main branch instead of master

[Christopher Davis <christopherdavis src gnome org>]

commit 75efe372edf25ce24a238fd7ebade910db0dc67e
Author: Christopher Davis <christopherdavis gnome org>
Date:   Sun Feb 20 12:15:00 2022 -0800

    flatpak: Use main branch instead of master

 build-aux/flatpak/org.gnome.baobab.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/build-aux/flatpak/org.gnome.baobab.json b/build-aux/flatpak/org.gnome.baobab.json
index 46478c4..e5e05d2 100644
--- a/build-aux/flatpak/org.gnome.baobab.json
+++ b/build-aux/flatpak/org.gnome.baobab.json
@@ -51,7 +51,8 @@
             "sources" : [
                 {
                     "type" : "git",
-                    "url" : "https://gitlab.gnome.org/GNOME/baobab.git";
+                    "url" : "https://gitlab.gnome.org/GNOME/baobab.git";,
+                    "branch" : "main"
                 }
             ]
         }