on job cleanup (scheduled task) projects are not cleared

#### Problem Description
project names from drop down list (job view) remain and fill up the list.

#### Steps to Reproduce
enter jobs with different project names.
wait until the history cleans them up.

#### Expected Results
project name filter should only show project names of jobs currently listed.

#### Actual Results
project name filter list still lists the project names for jobs not listed any longer.

#### Additonal Comments
SP_DeleteOldJobs procedure might be the faulty one as one of the last query is faulty
and should rather look like that (approx line 100):
DELETE FROM JobProjectName WHERE Id NOT IN (SELECT isnull(ProjectId, 1) FROM Job group by ProjectId UNION ALL SELECT isnull(ProjectId, 1) FROM JobHistory group by ProjectId);