gio/gdesktopappinfo: Free the wrapped argv array on launch failure

We create an array that we never free, ensure this is the case.
The previous commit gives CI a chance to check this with valgrind job.

Found as part of another review:
 - https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2839#note_1524922

gio/gdesktopappinfo.c

@@ -2963,6 +2963,7 @@ g_desktop_app_info_launch_uris_with_spawn (GDesktopAppInfo            *info,
 
           g_free (sn_id);
           g_list_free (launched_uris);
+          g_clear_pointer (&wrapped_argv, g_strfreev);
 
           goto out;
         }