fix failing profile api test by preventing double-adding of same alias

api/v3/Profile.php

@@ -580,8 +580,10 @@ function _civicrm_api3_buildprofile_submitfields($profileID, $optionsBehaviour =
         if(isset($profileFields[$profileID][$entityfield])) {
           unset($profileFields[$profileID][$entityfield]);
         }
-        // we will make the mixed case version (e.g. of 'Primary') an alias
-        $profileFields[$profileID][$fieldName]['api.aliases'][] = $entityfield;
+        if(!in_array($entityfield, $profileFields[$profileID][$fieldName]['api.aliases'])) {
+          // we will make the mixed case version (e.g. of 'Primary') an alias
+          $profileFields[$profileID][$fieldName]['api.aliases'][] = $entityfield;
+        }
       }
       /**
        * putting this on hold -this would cause the api to set the default - but could have unexpected behaviour