Fix an issue when the setting "Do not show the email field for guests' posts" does not affect on guests.
Fix an issue when the setting "Do not show the email field for guests' posts" does not affect on guests.

Signed-off-by: Bugo <a002fde19ceeb582a0d505ab21bebbad7d29232e@dragomano.ru>

StealthWombat/SMF2.1-more-forkery,StealthWombat/SMF2.1-more-forkery