fix error when demo is running : symbol lookup error:undefined symbol: _ZN13ScreencastingC1EPN8KWayland6Client8RegistryEiiP7QObject

libtaskmanager/screencasting.cpp

@@ -83,6 +83,12 @@ Screencasting::Screencasting(QObject *parent)
 {
 }
 
+Screencasting::Screencasting(Registry *registry, int id, int version, QObject *parent)
+    : QObject(parent)
+    , d(new ScreencastingPrivate(registry, id, version, this))
+{
+}
+
 Screencasting::~Screencasting() = default;
 
 ScreencastingStream *Screencasting::createWindowStream(const QString &uuid, CursorMode mode)