Allow parameter in 'AllowThirdPartyFraming'

[ttodua]

$cfg['AllowThirdPartyFraming'] is set to TRUE/FALSE only. I think it's a kinda limitation, because we should be able to set the intermediate value 'SAMEORIGIN' (as mentioned here )

at this moment, PMA uses this code:

        if (! $GLOBALS['cfg']['AllowThirdPartyFraming']) {
            header(
                'X-Frame-Options: DENY'
            );
        }

so, you should allow to use also 'SAMEORIGIN' value