KDirModel/KFileWidget: Use relative date formatting for Modified field

Méven Carrequested to merge
work/meven/kfilewidget-date-relative into master

Suggested in https://discuss.kde.org/t/relative-date-display-in-dolphin-file-picker-dialog/43197

Before:

image

After:

image

In dolphin this format is configurable, but this matches its default.

Edited by Méven Car

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