change get_web_root_url function name and add a comment to make its use more explicit

wcs/qommon/template.ptl

@@ -269,7 +269,7 @@ def decorate(body, response):
         except KeyError:
             pass
 
-    root_url = get_publisher().get_web_root_url()
+    root_url = get_publisher().get_application_static_files_root_url()
 
     if response.filter.get('admin_ezt'):
         header_menu = kwargs.get('header_menu')