Fix flickering caused by the premature destruction of texture IDs.

Don't give ownership of surface buffer texture IDs to the scene graph
texture object. The textures belongs to the client buffer and will be
continuously over the lifetime of the buffer whereas the scene graph
texture will typically only last the a single update.

src/compositor/compositor_api/qwaylandquickitem.cpp

@@ -289,7 +289,7 @@ class QWaylandSurfaceTextureProvider : public QSGTextureProvider
                     m_sgTex->bind();
                 }
             } else {
-                QQuickWindow::CreateTextureOptions opt = QQuickWindow::TextureOwnsGLTexture;
+                QQuickWindow::CreateTextureOptions opt;
                 QWaylandQuickSurface *surface = qobject_cast<QWaylandQuickSurface *>(surfaceItem->surface());
                 if (surface && surface->useTextureAlpha()) {
                     opt |= QQuickWindow::TextureHasAlphaChannel;