CRM-14133 - Fix add2Group query when Show No. of Top Donors field has a value (e.g. limit). Prior version was returning empty result set.

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* CRM-14133: Top Donor Report Results "Add to Group" Doesn't Work if "Show no." Filter Used
  http://issues.civicrm.org/jira/browse/CRM-14133
Merge pull request #2654 from davecivicrm/CRM-14133

CRM-14133 - Fix add2Group query when Show No. of Top Donors field has a ...