Summary:
16 and 22px sizes added for window-pin and unpin. Style was also updated for window-unpin.
edit-delete is redundant because it's already defined in edit.svg. I don't think it's used anywhere at all. It was actually window-close, but renamed to edit-delete for whatever reason.
Test Plan:
{F8195527, size=full}
1. Install patch to kdesrc-build environment
2. Run `plasmashell --replace &` in kdesrc-build environment
3. Check pin button in systray
Reviewers: #vdg, #plasma, cblack, ngraham
Reviewed By: #vdg, cblack, ngraham
Subscribers: cblack, kde-frameworks-devel
Tags: #frameworks
Differential Revision: https://phabricator.kde.org/D28228