Revert "Fix DAO to properly enforce desired collation"

Reverts civicrm/civicrm-core#3799

The change caused multiple regressions, e.g.
 * api_v3_ContactTest.testContactGetBirthDate
 * api_v3_ContactTest.testContactGetDeceasedDate
 * api_v3_JobTest.testCallSendReminderLimitTo   
 * CRM_Core_BAO_ActionScheduleTest.testMembershipEndDate_Match