Summary:
This fixes the binding loop and replaces a complicated bit of code with something much
simpler.

Test Plan:
No more binding loop warning when running `plasmashell` on the CLI

No meaningful difference in appearance for every combination of icon size and label
width in icon view

Reviewers: #plasma, davidedmundson

Reviewed By: #plasma, davidedmundson

Subscribers: davidedmundson, gvgeo, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D27261