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