fixed bug on hdx exports

Author: kshitijrajsharma

tasks/task_runners.py

@@ -278,7 +278,7 @@ def add_metadata(z,theme):
 
         if geojson :
             try:
-                response_back=geojson.fetch('GeoJSON')
+                response_back=geojson.fetch('GeoJSON',is_hdx_export=True)
                 finish_task('geojson',response_back=response_back)
             except Exception as ex :
                 raise ex