document-new icon follow ColorScheme-Text
Summary: icon follow now ColorScheme-Text color
Test Plan: change to breeze-dark and open kwrite the new icon didn't use the text color
Reviewers: VDG, ngraham
Reviewed By: VDG, ngraham
Subscribers: ngraham, kde-frameworks-devel, andreaska
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D18282