filechooser: Ignore non absolute current_folder urls

David Redondorequested to merge
work/cherry-pick-7c8e601a into Plasma/6.4

These do not make sense in cross process communication CCBUG:490827 SENTRY:XDG-DESKTOP-PORTAL-KDE-G4

(cherry picked from commit 7c8e601a)

Co-authored-by: David Redondo kde@david-redondo.de

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