Use layer-shell keyboard interactivity enum in logout greeter

The keyboard interactivity flag was changed from a bool to an enum.

logout-greeter/shutdowndlg.cpp

@@ -210,7 +210,7 @@ void KSMShutdownDlg::init()
     setKeyboardGrabEnabled(true);
     KWindowEffects::enableBlurBehind(winId(), true);
     if (auto w = LayerShellQt::Window::get(this)) {
-        w->setKeyboardInteractivity(true);
+        w->setKeyboardInteractivity(LayerShellQt::Window::KeyboardInteractivityExclusive);
         w->setExclusiveZone(-1);
         w->setLayer(LayerShellQt::Window::LayerOverlay);
     }