ClangFormat: Fix applying global settings

The actual apply() method was never called for the widget.

Change-Id: Idff194a36591db437cbe5695377005ed5a0b25d4
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cpptools/cppcodestylesettingspage.cpp

@@ -556,6 +556,8 @@ void CppCodeStyleSettingsPage::apply()
             originalCppCodeStylePreferences->setCurrentDelegate(m_pageCppCodeStylePreferences->currentDelegate());
             originalCppCodeStylePreferences->toSettings(QLatin1String(CppTools::Constants::CPP_SETTINGS_ID), s);
         }
+
+        m_widget->apply();
     }
 }