CRM-9683 set timezone in mysql when initialising so timestamp fields display correctly

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* CRM-9683: Implement timezone support for CiviMail
  http://issues.civicrm.org/jira/browse/CRM-9683
CRM-9683 - move timestamp setting inside !initialized fn
Merge pull request #75 from eileenmcnaughton/7.x-4.4

CRM-9683 set timezone in mysql when initialising so timestamp fields dis...