fix: add empty paragraph for spacing in oauth2.php and oidc.php

oauth2.php

@@ -133,6 +133,7 @@ $jsonFlags = JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES
         </li>
       </ul>
     </nav>
+    <p></p>
     <?php if (empty($_SESSION['access_token'])): ?>
       <h3>Non connecté</h3>
       <a href="?action=login"><button>Se connecter</button></a>

oidc.php

@@ -143,6 +143,7 @@ $jsonFlags = JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES
         </li>
       </ul>
     </nav>
+    <p></p>
     <?php if (empty($_SESSION['user_id'])): ?>
       <h3>Non connecté</h3>
       <a href="?action=login"><button>Se connecter</button></a>