change export to csv

Controllers/ExportController.php

@@ -86,7 +86,7 @@ class ExportController extends ControllerBase
         $layerName = $request->layer;
         $fields = implode($request->fields, ',');
         $map = $request->map;
-        $wfsRequest= $request->wfsRequest;
+        $wfsRequest= str_replace("geojson", "csv", $request->wfsRequest);
 
         if($map == null) 
         {