Use Qt::SplitBehavior in preference to QString::SplitBehavior

The Qt version was added in 5.14 "for use as eventual replacement for
QString::SplitBehavior." Move another step closer to that goal.

Change-Id: Ie19f7580d75694982ac26c08ad5aabb73d830494
Reviewed-by: Johan Helsing <johanhelsing@gmail.com>

src/plugins/platforms/wayland/qwaylandwindow.cpp

@@ -157,7 +157,7 @@ void QWaylandWindow::initWindow()
                 QFileInfo fi = QCoreApplication::instance()->applicationFilePath();
                 QStringList domainName =
                         QCoreApplication::instance()->organizationDomain().split(QLatin1Char('.'),
-                                                                                 QString::SkipEmptyParts);
+                                                                                 Qt::SkipEmptyParts);
 
                 if (domainName.isEmpty()) {
                     mShellSurface->setAppId(fi.baseName());