Trim the Verification Code field before validating

[NickJH]

If you copy your validation code from you e-mail by double-clicking on the verification code to select the code, when you paste it into the Verification Code field it pastes with a leading blank and this fails verification. I think it would be a good idea to trim the field before validating it. This can be achieved by changing line 915 of /usr/clearos/apps/two_factor_auth/libraries/Two_Factor_Auth.php from if (! preg_match("/^([a-zA-Z0-9]+)$/", $code)) to if (! preg_match("/^([a-zA-Z0-9]+)$/", trim($code)))

Tested with the Thunderbird e-mail client.