Add view-private icon
Summary:
BUG: 401646
Test Plan: Search the icon in Cuttlefish.
Reviewers: Breeze, VDG, Falkon, ngraham, ndavis
Reviewed By: Breeze, VDG, ngraham, ndavis
Subscribers: drosca, ndavis, filipf, ngraham, VDG, kde-frameworks-devel, Breeze
Tags: Frameworks, Breeze, VDG
Differential Revision: https://phabricator.kde.org/D17419