remove obsolete code

ext_localconf.php

@@ -1,25 +1,3 @@
 <?php
 
-use TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider;
-use TYPO3\CMS\Core\Imaging\IconRegistry;
-use TYPO3\CMS\Core\Utility\GeneralUtility;
-
 defined('TYPO3_MODE') || die();
-
-call_user_func(
-  function () {
-      $iconRegistry = GeneralUtility::makeInstance(IconRegistry::class);
-      
-      $iconRegistry->registerIcon(
-          'begriffe_list_record_icon',
-          SvgIconProvider::class,
-          ['source' => 'EXT:begriffmgt/Resources/Public/Icons/book.png']
-      );
-
-      $iconRegistry->registerIcon(
-        'begriffe_module_icon',
-        SvgIconProvider::class,
-        ['source' => 'EXT:begriffmgt/Resources/Public/Icons/chatbot.svg']
-    );
-  }
-);