Adjusting the save_config_options() call to include $form (Bug #1360943)

To be more like the validate_config_options() call and so allow for
something other than the generic success message.

Change-Id: I36a6fec227c525776b58fd29c1548fb30b62a92c
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
Merge "Adjusting the save_config_options() call to include $form (Bug #1360943)"