mod_muc: Better map restrict_room_creation to role permissions (behaviour change)

With this change and 427dd01f0864, room creation is now effectively restricted
to parent-host users by default. This is a better default than previous
Prosody versions (where room creation was not restricted).

The "local" option for restrict_room_creation is no longer used (any value
other than true/false won't change the default behaviour).

restrict_room_creation = true will grant prosody:admin the ability to create
rooms.

restrict_room_creation = false disables all permission checks.

Anything between these two can be achieved using custom roles and permissions.

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