Revert "reserve space for checkable widgets in menu items"
Summary: This reverts commit 8989f8fd9c2c98adec5d73755a869beeb3ced600.
Reviewers: Breeze, hpereiradacosta
Reviewed By: hpereiradacosta
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D10530