kcmkwin/kwinscripts: Hide help button

There is no help for this KCM, so don't show the Help button.

BUG: 442460
FIXED-IN: 5.23

src/kcmkwin/kwinscripts/module.cpp

@@ -44,6 +44,9 @@ Module::Module(QWidget *parent, const QVariantList &args) :
     about->addAuthor(i18n("Tamás Krutki"));
     setAboutData(about);
 
+    // Hide the help button, because there is no help
+    setButtons(Apply | Default);
+
     ui->setupUi(this);
 
     ui->messageWidget->hide();