simplify use_json variable call

Co-authored-by: Adam Ginsburg <[email protected]>

Author: jaymedina

astroquery/mast/collections.py

@@ -163,7 +163,7 @@ def query_region_async(self, coordinates, *, radius=0.2*u.deg, catalog="Hsc",
             params[prop] = value
 
         # Parameters will be passed as JSON objects only when accessing the PANSTARRS API
-        use_json = True if catalog.lower() == 'panstarrs' else False
+        use_json = catalog.lower() == 'panstarrs'
 
         return self._current_connection.service_request_async(service, params, pagesize=pagesize, page=page,
                                                               use_json=use_json)