[FileMetaDataWidget] Allow inline configuration of visible properties

Summary:
Instead of opening an additional dialog, allow selection and deselection
of visible properties directly in the widget.

CCBUG: 389571

Reviewers: Baloo, Dolphin, Frameworks, ngraham, astippich, elvisangelaccio

Reviewed By: Baloo, Dolphin, ngraham, elvisangelaccio

Subscribers: elvisangelaccio

Tags: Baloo

Differential Revision: https://phabricator.kde.org/D20524