Remove useless declaration in SettingsForm constructor.

Closes #3502272

src/Form/SettingsForm.php

@@ -35,8 +35,6 @@ final class SettingsForm extends ConfigFormBase {
     protected ModuleHandlerInterface $moduleHandler,
   ) {
     parent::__construct($configFactory, $typedConfigManager);
-    $this->libraryDiscovery = $libraryDiscovery;
-    $this->moduleHandler = $moduleHandler;
   }
 
   /**