Add missing includes

It worked until now because they were included transitively

kcmkwin/kwindesktop/animationsmodel.cpp

@@ -9,6 +9,8 @@
 
 #include "animationsmodel.h"
 
+#include <KConfigGroup>
+
 namespace KWin
 {
 

kcmkwin/kwindesktop/virtualdesktops.cpp

@@ -14,6 +14,7 @@
 #include <KAboutData>
 #include <KConfigGroup>
 #include <KLocalizedString>
+#include <KPluginFactory>
 
 K_PLUGIN_FACTORY_WITH_JSON(VirtualDesktopsFactory, "kcm_kwin_virtualdesktops.json", registerPlugin<KWin::VirtualDesktops>();)
 

kcmkwin/kwineffects/kcm.cpp

@@ -11,6 +11,7 @@
 #include <KAboutData>
 #include <KLocalizedString>
 #include <KNS3/DownloadDialog>
+#include <KPluginFactory>
 
 #include <QQuickWindow>
 #include <QWindow>