Cmake: Use new settings page convenience for CMakeSettings

Following the pattern introduced in 809e62e373.

Change-Id: I3fc42afcdfd71634bd0749cb970c4bf94ed7932a
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/cmakeprojectmanager/cmakesettingspage.h

@@ -26,30 +26,16 @@
 #pragma once
 
 #include <coreplugin/dialogs/ioptionspage.h>
-#include <utils/pathchooser.h>
-
-#include <QPointer>
-
-#include "cmaketool.h"
 
 namespace CMakeProjectManager {
 namespace Internal {
 
-class CMakeToolConfigWidget;
-
 class CMakeSettingsPage : public Core::IOptionsPage
 {
     Q_OBJECT
 
 public:
     CMakeSettingsPage();
-
-    QWidget *widget() override;
-    void apply() override;
-    void finish() override;
-
-private:
-    CMakeToolConfigWidget *m_widget = nullptr;
 };
 
 } // namespace Internal