fix: update txt records status on change
Closes #1 (closed) : txt records status not updated
As described in https://github.com/AlternC/AlternC/issues/514, when enabling/disabling a txt record its status is not updated in the web interface.
As a consequence /dom_substatus.php keeps displaying : "Desactivation/Update pending"
This is a follow-up for #d0148ffa (Fix sub-domains activation/deactivation)