Fixed smtp send mail.

Error:
Warning: fsockopen() expects parameter 5 to be double, string given in /Applications/XAMPP/xamppfiles/htdocs/menon/system/library/mail.php on line 167Notice: Error: () in /Applications/XAMPP/xamppfiles/htdocs/menon/system/library/mail.php on line 170

Cause:
This error occurred because it was not set value for the timeout.
Since there was no condition he changed the default value (`php public $ smtp_timeout = 5; `) for empty string.

Thanks.