remote-delete: Avoid a "remote not found" error when deleting an -origin remote

Closes: #2626
Approved by: matthiasclasen

app/flatpak-builtins-remote-delete.c

@@ -123,6 +123,10 @@ flatpak_builtin_remote_delete (int argc, char **argv, GCancellable *cancellable,
         }
     }
 
+  if (g_str_has_suffix (remote_name, "-origin"))
+    // The remote has already been deleted because all its refs were deleted.
+    return TRUE;
+
   if (!flatpak_dir_remove_remote (preferred_dir, opt_force, remote_name,
                                   cancellable, error))
     return FALSE;