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: Remote Roster Management
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Introduction
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This module adds support for [XEP-0321: Remote Roster Management] which
is commonly used to allow components such as transports to modify the
rosters of local users.