fix: add missing libKF5NewStuffWidgets.so* files

kf5-knewstuff.spec

@@ -84,6 +84,7 @@ developing applications that use %{name}.
 %{_kf5_datadir}/qlogging-categories5/%{framework}*
 %{_kf5_libdir}/libKF5NewStuff.so.*
 %{_kf5_libdir}/libKF5NewStuffCore.so.*
+%{_kf5_libdir}/libKF5NewStuffWidgets.so.*
 %{_kf5_datadir}/kf5/kmoretools/
 %dir %{_kf5_qmldir}/org/
 %dir %{_kf5_qmldir}/org/kde
@@ -96,6 +97,7 @@ developing applications that use %{name}.
 %{_kf5_includedir}/KNewStuff3/
 %{_kf5_libdir}/libKF5NewStuff.so
 %{_kf5_libdir}/libKF5NewStuffCore.so
+%{_kf5_libdir}/libKF5NewStuffWidgets.so
 %{_kf5_libdir}/cmake/KF5NewStuff/
 %{_kf5_libdir}/cmake/KF5NewStuffCore/
 %{_kf5_libdir}/cmake/KF5NewStuffQuick/