[KFilePlacesView] Change icon for the 'Edit' context menu entry in Places panel
Summary: Twin of https://phabricator.kde.org/D15938 for dolphin
Test Plan: In Kate, open the Open File dialog and right-click on a Place in left panel.
Reviewers: Frameworks, ngraham
Reviewed By: ngraham
Subscribers: kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D15952