[quota] Use new breeze icons
Summary:
Shipping an icon ourself is causing trouble. Use the new Breeze icons from D21957.
BUG: 389311
Reviewers: Plasma, ngraham, ndavis
Reviewed By: ngraham, ndavis
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D21958