muc: Re-allow non-admins to configure persistence (thanks Meaz)

Non-admins don't have a role on MUC services by default. Not even
prosody:user. This meant they had no :create-persistent-room permission, even
if muc_room_allow_persistent was true (the default).

Now we only check the role permissions if persistent room creation is
restricted, otherwise we skip any permission checks, just like previous
versions.

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