Event_title can't be filtered with the search builder

When you filter on event title with the search builder, the specific where clause for event title gets ignored.
This is because event_title is not implemented in CRM_Event_BAO_Query->whereClauseSingle().

Steps to reproduce

• go to http://d45.demo.civicrm.org/civicrm/contact/search/builder
• search for Participant -> Event Id -> = -> 3 : gives 18 participants ( = correct)
• search for Participant -> Event Title -> Like -> "Rain-forest%" : gives 221 participants