Fix min_refresh_interval handling on preferences save (#1489073)

Aleksander Machniak

2013-04-28 4cb8ced1a4ca32c6837e848dbfc585892b802f67

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<?php
 
// Help content iframe source
// $rcmail_config['help_source'] = 'http://trac.roundcube.net/wiki';
$rcmail_config['help_source'] = '';