[Icon Widget] Don't use plasma theme for icon

Authored by broulik on Jun 2 2016, 9:58 AM.

Description

[Icon Widget] Don't use plasma theme for icon

This avoids picking a black and white icon like it would for KMail.
Neither Task Manager nor Kickoff use plasma theme icons for applications.

Differential Revision: https://phabricator.kde.org/D1745

Details