MDL-32052 simplify subclassing of auth_email

auth/email/auth.php

@@ -127,7 +127,7 @@ class auth_plugin_email extends auth_plugin_base {
             if ($user->confirmed) {
                 return AUTH_CONFIRM_ALREADY;
 
-            } else if ($user->auth != 'email') {
+            } else if ($user->auth != $this->authtype) {
                 return AUTH_CONFIRM_ERROR;
 
             } else if ($user->secret == $confirmsecret) {   // They have provided the secret key to get in

auth/email/config.html

@@ -25,7 +25,7 @@
 </tr>
 <?php
 
-print_auth_lock_options('email', $user_fields, get_string('auth_fieldlocks_help', 'auth'), false, false);
+print_auth_lock_options($this->authtype, $user_fields, get_string('auth_fieldlocks_help', 'auth'), false, false);
 
 ?>
 </table>