Fix a comment in worker.c

Hi,

While reading the code, I realized that the second sentence of the
following comment in worker.c is not correct:

/*
* Exit if the subscription was disabled. This normally should not happen
* as the worker gets killed during ALTER SUBSCRIPTION ... DISABLE.
*/
if (!newsub->enabled)
{
ereport(LOG,
(errmsg("logical replication apply worker for
subscription \"%s\" will "
"stop because the subscription was disabled",
MySubscription->name)));

proc_exit(0);
}

IIUC the apply worker normally exits here when the subscription is
disabled since we don't stop the apply worker during ALTER
SUBSCRIPTION DISABLE. I've attached a patch to remove it.

Regards,

--
Masahiko Sawada
EDB: https://www.enterprisedb.com/