Remove unused includes of Q[H/V]BoxLayout

Change-Id: Ia90b30b634281414268e00722771470f1e7b69c0
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/debugger/unstartedappwatcherdialog.cpp

@@ -29,7 +29,6 @@
 #include <QLabel>
 #include <QLineEdit>
 #include <QPushButton>
-#include <QVBoxLayout>
 
 using namespace ProjectExplorer;
 using namespace Utils;