Fix crash when managing kits

Change-Id: I8c70745a72f67a810abd902ddadea1eb558dad7d
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/qt4projectmanager/qt4targetsetupwidget.cpp

@@ -229,8 +229,7 @@ void Qt4TargetSetupWidget::manageKit()
 
     page->showKit(m_kit);
     Core::ICore::showOptionsDialog(QLatin1String(ProjectExplorer::Constants::PROJECTEXPLORER_SETTINGS_CATEGORY),
-                                   QLatin1String(ProjectExplorer::Constants::KITS_SETTINGS_PAGE_ID),
-                                   this);
+                                   QLatin1String(ProjectExplorer::Constants::KITS_SETTINGS_PAGE_ID));
 }
 
 void Qt4TargetSetupWidget::setProFilePath(const QString &proFilePath)