[minor] fix autoname for GST HSN Code (#9536)

diff --git a/erpnext/regional/doctype/gst_hsn_code/gst_hsn_code.json b/erpnext/regional/doctype/gst_hsn_code/gst_hsn_code.json
index 9aad1bf..6f122135 100644
--- a/erpnext/regional/doctype/gst_hsn_code/gst_hsn_code.json
+++ b/erpnext/regional/doctype/gst_hsn_code/gst_hsn_code.json
@@ -3,7 +3,7 @@
  "allow_guest_to_view": 0, 
  "allow_import": 0, 
  "allow_rename": 0, 
- "autoname": "fieldname:hsn_code", 
+ "autoname": "field:hsn_code", 
  "beta": 0, 
  "creation": "2017-06-21 10:48:56.422086", 
  "custom": 0, 
@@ -84,7 +84,7 @@
  "issingle": 0, 
  "istable": 0, 
  "max_attachments": 0, 
- "modified": "2017-06-21 13:27:59.149202", 
+ "modified": "2017-06-29 21:28:09.053351", 
  "modified_by": "Administrator", 
  "module": "Regional", 
  "name": "GST HSN Code",