[fix] issue #11456 (#11612)

using bench export-fixtures create a erpnext/fixtures/web_form.json file 
see :
https://github.com/frappe/erpnext/issues/11456#issuecomment-344846063
diff --git a/erpnext/hooks.py b/erpnext/hooks.py
index 44a3b18..d929428 100644
--- a/erpnext/hooks.py
+++ b/erpnext/hooks.py
@@ -51,7 +51,7 @@
 
 calendars = ["Task", "Production Order", "Leave Application", "Sales Order", "Holiday List"]
 
-fixtures = ["Web Form"]
+
 
 domains = {
 	'Distribution': 'erpnext.domains.distribution',