Remove 'What's this?' icon from "Waiting for applications" dialog

Change-Id: I6c603cd540d8c688fc6302380ea4e8c716ed8ef4
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/projectexplorer/waitforstopdialog.cpp

@@ -39,6 +39,7 @@ WaitForStopDialog::WaitForStopDialog(QList<ProjectExplorer::RunControl *> runCon
     m_runControls(runControls)
 {
     setWindowTitle(tr("Waiting for Applications to Stop"));
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
 
     auto layout = new QVBoxLayout();
     setLayout(layout);