fixing order of parameters in geocoder_widget_resolve_deltas method

Closes #3254201

geocoder.widget.inc

@@ -535,9 +535,11 @@ function geocoder_widget_get_field_concat($items) {
  * Given a list of geometries, and user configuration on how to handle deltas,
  * we created a list of items to be inserted into the fields.
  */
-function geocoder_widget_resolve_deltas($geometries, $delta_handling = 'default', $target_info) {
+function geocoder_widget_resolve_deltas($geometries, $delta_handling, $target_info) {
   $values = array();
-
+  if (empty($delta_handling)) {
+    $delta_handling = 'default';
+  }
   // Default delta handling: just pass one delta to the next.
   if ($delta_handling === 'default') {
     foreach ($geometries as $geometry) {