Create Relationship - Find Target Contact combo-box doesn't submit correct search criteria on exact matching contact

When an "exact match" contact ID is selected in the Find Target Contact combobox - we should return only that row. Currently - if there are other contacts w/ matches on first N characters - we return all of them.

You can see this on demo by creating an "employee of relationship" and entering "Forest & Bird". There are 5 contacts starting w/ that string. If you select "Forest & Bird - North Shore" from the list in the combo-box, and click Seach - we return all 5 contacts. We should only return the selected contact.

See this post for the problems that this bug can cause (when there are too many matches):
http://forum.civicrm.org/index.php/topic,3467.0.html