CMakePM: Persist "Do not show again" for preset reload dialog

Was not persisted and would pop up every time.

Change-Id: I6fa6d7d57948a917f08ebc91382774355734f7a6
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/cmakeprojectmanager/cmakeprojectmanager.cpp

@@ -246,6 +246,8 @@ void CMakeManager::reloadCMakePresets()
             {QMessageBox::Yes, Tr::tr("Reload")},
         });
 
+    settings->writeSettings(Core::ICore::settings());
+
     if (clickedButton == QMessageBox::Cancel)
         return;