Tweak KFileWidget::slotOk logic when in files+directory mode

Albert Astals Cid requested to merge work/aacid/431454 into master

I don't see why we wouldn't do the "if this is an absolute path, try opening that and not what tokenize gave us" when in the files+directory mode, so changed to not do it when in the onlyDirectoryMode

BUGS: 431454

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