Use appropriate icon for a cancel button that will ask for a new name

Summary: When a dialog has a cancel button that says, "Enter a different name", give that button the edit-rename icon instead of the standard cancel icon.

Test Plan:

Reviewers: Frameworks, VDG, abetts

Reviewed By: VDG, abetts

Subscribers: abetts, broulik, dfaure, kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D14640