Make find-location show a magnifier on a map, to be different to mark-location

Summary:
This changes find-location, and adds the 22px variant.
BUG: 407061

Test Plan:
{F8170733}

{F8170734}

Reviewers: #vdg, ngraham, ndavis

Reviewed By: #vdg, ngraham, ndavis

Subscribers: ngraham, ndavis, kde-frameworks-devel

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D27983