[Properties dialog] Make all field values on general tab selectable

Summary:
The {nav Location} field was already selectable; this patch extends that courtesy to all the rest.

BUG: 105692
FIXED-IN 5.48

Test Plan: {F5913321}

Reviewers: #frameworks, #dolphin, elvisangelaccio

Reviewed By: #dolphin, elvisangelaccio

Subscribers: kde-frameworks-devel

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D13554