reverting one last time because of errors in my test env

[RealAngeleno]

Reverts #707

$success = $query->verify($response, $_SERVER['REMOTE_ADDR']);
if (!$success) {
error($config['error']['captcha']);
}

in post.php show {"readyState":4,"responseText":"{"error":"Caught fatal error: Uncaught Error: Call to a member function verify() on null in \/var\/www\/vichan\/post.php:624\nStack trace:\n#0 {main}\n thrown in \/var\/www\/vichan\/post.php<\/strong> on line 624"}","responseJSON":{"error":"Caught fatal error: Uncaught Error: Call to a member function verify() on null in /var/www/vichan/post.php:624\nStack trace:\n#0 {main}\n thrown in /var/www/vichan/post.php on line 624"},"status":500,"statusText":"Internal Server Error"}

And removing such causes vichan to believe a captcha is enabled, while it may not be. I'll reopen the original PR and forget this reverting happened.