Remove unnecessary window and button icon code

Authored by vkrause on Oct 19 2019, 2:23 PM.

Description

Remove unnecessary window and button icon code

Summary: Qt does all that automatically for us.

Reviewers: mlaurent

Reviewed By: mlaurent

Subscribers: kde-pim

Tags: KDE PIM

Maniphest Tasks: T11637

Differential Revision: https://phabricator.kde.org/D24780

Details