Disable session restoration in kaccess

Summary:
It is loaded by kcminit in kcmaccess we don't need to try and load it
twice.

Test Plan: Rebooted, still had a kaccess

Reviewers: #plasma, mart

Reviewed By: #plasma, mart

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D5989