Remove unused includes of QGridLayout

Change-Id: Ia0823fe1dbadb7c68efc431c3bf0f1ba621a9484
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/vcsbase/vcsbaseeditorconfig.cpp

@@ -9,7 +9,6 @@
 #include <QAction>
 #include <QComboBox>
 #include <QDebug>
-#include <QGridLayout>
 #include <QStringList>
 
 using namespace Utils;