Use wlr_output's schedule_frame do schedule render

Author: zccrs

src/server/qtquick/woutputhelper.cpp

@@ -87,6 +87,7 @@ class Q_DECL_HIDDEN WOutputHelperPrivate : public WObjectPrivate
 
     inline void update() {
         setContentIsDirty(true);
+        qwoutput()->schedule_frame();
     }
 
     W_DECLARE_PUBLIC(WOutputHelper)

src/server/qtquick/woutputrenderwindow.cpp

@@ -1848,8 +1848,7 @@ void WOutputRenderWindow::update()
 {
     Q_D(WOutputRenderWindow);
     for (auto o : std::as_const(d->outputs))
-        o->update(); // make contents to dirty
-    d->scheduleDoRender();
+        o->update(); // will scheduleDoRender
 }
 
 void WOutputRenderWindow::update(WOutputViewport *output)