Remove uneeded timeout monitor

Summary:
It's in case klauncher fails to return from autostart, however autostart
is now handled by ksmserver in process - so this will always be called.

I failed to notice it when I did the initial move

Reviewers: #plasma, mart

Reviewed By: mart

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D3054