Fix crash when guiding unexpectedly restarting with no current job.
Summary: When Scheduler stops activity, and specifically stops guiding, guiding timer is still active and will crash KStars when elapsing.
- Make Scheduler finish a job that is guiding, so that there is no current job.
- Without the change, KStars crashes after the guider timeout elapses (hardcoded 5s).
- With the change, Scheduler does not automatically restart guiding.
Reviewers: mutlaqja, wreissenberger, alexcherney
Reviewed By: mutlaqja
Tags: KDE Edu
Differential Revision: https://phabricator.kde.org/D24107