email: maintain entered data on error

scp/emailtest.php

@@ -48,11 +48,12 @@ if($_POST){
         $errors['err']=__('Error sending email - try again.');
     }
 }
-$info=Format::htmlchars(($errors && $_POST)?$_POST:$info);
 $nav->setTabActive('emails');
 $ost->addExtraHeader('<meta name="tip-namespace" content="emails.diagnostic" />',
     "$('#content').data('tipNamespace', '".$tip_namespace."');");
 require(STAFFINC_DIR.'header.inc.php');
+
+$info=Format::htmlchars(($errors && $_POST)?$_POST:$info);
 ?>
 <form action="emailtest.php" method="post" id="save">
  <?php csrf_token(); ?>