sql fixes CRM-13692

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* CRM-13692: Unknown column 'civicrm_activity.source_contact_id' when using Batch Profile Update for Activities
  http://issues.civicrm.org/jira/browse/CRM-13692
removed source contact field from the list of the available profile fields, CRM-13692

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* CRM-13692: Unknown column 'civicrm_activity.source_contact_id' when using Batch Profile Update for Activities
  http://issues.civicrm.org/jira/browse/CRM-13692
Merge pull request #1894 from kurund/CRM-13692

CRM-13692, fixed sql break due to activity restructure for activity batch update via profile