admin parametres: hr separator between current/new password, drop new-password top border

app/templates/admin/parametres.php

@@ -173,9 +173,10 @@
                     <input type="password" id="current_password"
                            name="current_password" required autocomplete="current-password">
                 </div>
+                <hr class="param-password-separator">
                 <?php endif; ?>
 
-                <div>
+                <div class="param-form-row--flush">
                     <label for="new_password">Nouveau mot de passe</label>
                     <input type="password" id="new_password"
                            name="new_password" required autocomplete="new-password"