[calls] flatpak: Change calls URL

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 9ebb738b0f79b541f8237eb8806e16c0198ee353
Author: Evangelos Ribeiro Tzaras <evangelos tzaras puri sm>
Date:   Tue Jul 13 03:29:57 2021 +0200

    flatpak: Change calls URL

 org.gnome.Calls.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/org.gnome.Calls.json b/org.gnome.Calls.json
index 4eb4e7d4..043e8472 100644
--- a/org.gnome.Calls.json
+++ b/org.gnome.Calls.json
@@ -300,7 +300,7 @@
             "sources" : [
                 {
                     "type" : "git",
-                    "url" : "https://source.puri.sm/Librem5/calls.git";
+                    "url" : "https://gitlab.gnome.org/GNOME/calls.git";
                 }
             ]
         }