Deleted contacts are included in advanced search results when using Display As - Related Contacts option

To replicate:

• Find an existing sample organization
• Add > 1 'employer of' relationship for the organization
• Now delete one of the employee records
• Go to advanced search:

• enter the org name in the top field (complete or partial name)
• change Display Results As to "Related Contacts" > "Employee of"

Results will include the deleted employee contact record.

It looks like we need to add " AND contact_b.is_deleted " to the WHERE clause constructed by CRM_Contact_BAO_Query::filterRelatedContacts(). I took a shot at doing this but didn't quite get it right. Hopefully the fix is more obvious to you