KFileWidget: Fix key navigation escaping in save dialogs

Akseli Lahtinenrequested to merge
work/akselmo/key-navigation-kfilewidget into master

In save dialogs the keyboard navigation would escape during file highlighting, since the fileHighlight sets the focus for fileName bar for mouse operations.

This makes sure the user has to press Tab to explicitly escape the keyboard navigation mode. For clicking the items, it should not affect at all.

BUG: 466206 FIXED-IN: 6.14

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