When edit a job it does not edit host

Hi,

Firstly I used default "cron.host" setting but I had a "connection error". I changed my "cron.host" parameter to "/var/run/postgresql".
Of course, I restart afterwards and check parameters:

```
postgres=# select name, setting from pg_settings where name like '%cron%';
name | setting
-----------------------------------+---------------------
cron.database_name | postgres
cron.enable_superuser_jobs | on
cron.host | /var/run/postgresql
cron.log_min_messages | warning
cron.log_run | on
cron.log_statement | on
cron.max_running_jobs | 32
cron.use_background_workers | off
(8 rows)
```

Then, I tried to renew my job but I only updated command and schedule. If a jobid/jobname exists and if we refresh the job, it is better to refresh other parameters I think. What do you think?

I solved my issue unschedule and schedule it again.

Thanks!