mod_muc_webchat_url: Don't save templated value This prevents changing of other settings without touching the webchat URL from saving the template value. Otherwise the URL will still be advertised when configuring members-only or hidden.

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summary: Log a message once per minute
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This module sends `-- MARK --` to the log once per minute. This may be
useful to give a sense of how busy the server is or see that logging and
timers are still working.