wayland: Update shadow immediately

Updating OpenGL textures no longer takes place immediately.

src/internalwindow.cpp

@@ -117,10 +117,7 @@ bool InternalWindow::eventFilter(QObject *watched, QEvent *event)
             setSkipCloseAnimation(m_handle->property(s_skipClosePropertyName).toBool());
         }
         if (pe->propertyName() == s_shadowEnabledPropertyName) {
-            // Some dialog e.g. Plasma::Dialog may update shadow in the middle of rendering.
-            // The opengl context changed by updateShadow may break the QML Window rendering
-            // and cause crash.
-            QMetaObject::invokeMethod(this, &InternalWindow::updateShadow, Qt::QueuedConnection);
+            updateShadow();
         }
         if (pe->propertyName() == "kwin_windowType") {
             m_windowType = m_handle->property("kwin_windowType").value<NET::WindowType>();