[swell-foop] Use gnome games 1.8 for flatpak build.

[Robert Roth <robertroth src gnome org>]

commit 19270781f455340bc883ea0284c14f419e57a3b8
Author: Robert Roth <robert roth off gmail com>
Date:   Sat Mar 12 18:04:33 2022 +0000

    Use gnome games 1.8 for flatpak build.

 org.gnome.SwellFoop.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/org.gnome.SwellFoop.json b/org.gnome.SwellFoop.json
index e54fafc..ef210cd 100644
--- a/org.gnome.SwellFoop.json
+++ b/org.gnome.SwellFoop.json
@@ -82,6 +82,7 @@
             "sources": [
                 {
                     "type": "git",
+                    "branch": "games-1-8",
                     "url": "https://gitlab.gnome.org/GNOME/libgnome-games-support.git";
                 }
             ]