AutoTest: Remove unused variables

Removes after refactorings now unused local or member.

Change-Id: I56f16cb2058c6d15c3906550480ddcb32ef600c8
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/autotest/projectsettingswidget.cpp

@@ -39,7 +39,6 @@ private:
                             const QHash<Autotest::ITestTool *, bool> &testTools);
     void onActiveFrameworkChanged(QTreeWidgetItem *item, int column);
     TestProjectSettings *m_projectSettings;
-    QComboBox *m_useGlobalSettings = nullptr;
     QTreeWidget *m_activeFrameworks = nullptr;
     QComboBox *m_runAfterBuild = nullptr;
     QTimer m_syncTimer;