Fix warning

Unused variable

Change-Id: Ic7baf8b17cb0b6a5091efe3bfe262ed42b1e9bda
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

src/plugins/coreplugin/themesettings.cpp

@@ -434,7 +434,6 @@ void ThemeSettings::apply()
 
     {
         d->m_ui->editor->model()->toTheme(creatorTheme());
-        QPalette newPalette = creatorTheme()->palette(qApp->palette());
         foreach (QWidget *w, QApplication::topLevelWidgets())
             w->update();
     }