Change: replace the class for the 2FA-form container with "form-login"

This makes the two factor form appearing in the middle of the screen like the login form does.

app/Template/twofactor/check.php

@@ -1,4 +1,4 @@
-<section class="page">
+<section class="form-login">
     <div class="page-header">
         <h2><?= t('Two factor authentication') ?></h2>
     </div>
@@ -12,4 +12,4 @@
             <button type="submit" class="btn btn-blue"><?= t('Check my code') ?></button>
         </div>
     </form>
-</section>
+</section>