CRM-13638 : verified and applied patch, just a minor modification done

the minor modification in the patch consists removing of <code> || ($context == 'search') </code> condition as it negates <code> !in_array($context, array('search', .....)) </code> condition in same 'if' statement

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* CRM-13638: Saving an Activity record from Search causes "With Contact" field value to be deleted
  http://issues.civicrm.org/jira/browse/CRM-13638