gnu: KDE: Update remaining packages to 5.49.0.

These packages have been missed in
600f1ad8, since the `guix refresh
--type=kde` does not honor the sub-directory for the "portingaids".

* gnu/packages/kde-frameworks.scm (kdelibs4support, khtml, kjs,
  kjsembed, kmediaplayer, kross): Update to 5.49.0.