testing: ignore GNOME keyring leak also for other operations

Recently the same error showed up also with a gnome_keyring_find_* function
in the backtrace. Ignore that, too.

test/sys.supp

@@ -830,7 +830,7 @@
    ...
    fun:gcry_mpi_snew
    ...
-   fun:gnome_keyring_set_network_password*
+   fun:gnome_keyring_*_network_password*
    fun:*GNOME*Password*
 }