MDL-78942 tool_mfa: replace deprecated coding standards annotation.

Replace with equivalent `phpcs` annotation as appropriate, same as
done previously in a5c91474ee (see that commit for further context).

admin/tool/mfa/classes/local/form/verification_field.php

@@ -76,10 +76,11 @@ class verification_field extends \MoodleQuickForm_text {
         return parent::__construct($elementname, $elementlabel, $attributes);
     }
 
-    // @codingStandardsIgnoreStart
     /**
      * Returns HTML for this form element.
      *
+     * phpcs:disable moodle.NamingConventions.ValidFunctionName.LowercaseMethod
+     *
      * @return string
      */
     public function toHtml(): string {
@@ -101,7 +102,6 @@ class verification_field extends \MoodleQuickForm_text {
         }
         return $result;
     }
-    // @codingStandardsIgnoreEnd
 
     /**
      * Setup and return the script for autosubmission while inside the secure layout.

admin/tool/mfa/classes/manager.php

@@ -349,12 +349,10 @@ class manager {
             try {
                 // Clear locked user factors, they may now reauth with anything.
                 @$DB->set_field('tool_mfa', 'lockcounter', 0, ['userid' => $USER->id]);
-            // @codingStandardsIgnoreStart
+                // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch
             } catch (\Exception $e) {
                 // This occurs when upgrade.php hasn't been run. Nothing to do here.
-                // Coding standards ignored, they break on empty catches.
             }
-            // @codingStandardsIgnoreEnd
 
             // Fire post pass state factor actions.
             $factors = factor::get_active_user_factor_types();

admin/tool/mfa/factor/email/email.php

@@ -22,13 +22,14 @@
  * @copyright   Catalyst IT
  * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
+
 // Ignore coding standards for login check, this page does not require login.
-// @codingStandardsIgnoreStart
+// phpcs:disable moodle.Files.RequireLogin.Missing
 require_once(__DIR__ . '/../../../../../config.php');
+
 $instanceid = required_param('instance', PARAM_INT);
 $pass = optional_param('pass', '0', PARAM_INT);
 $secret = optional_param('secret', 0, PARAM_INT);
-// @codingStandardsIgnoreEnds
 
 $context = context_system::instance();
 $PAGE->set_context($context);