fix: remove readonly from billing address

erpnext/stock/doctype/delivery_note/delivery_note.json

@@ -395,8 +395,7 @@
    "fieldtype": "Link",
    "label": "Billing Address Name",
    "options": "Address",
-   "print_hide": 1,
-   "read_only": 1
+   "print_hide": 1
   },
   {
    "fieldname": "tax_id",
@@ -1309,7 +1308,7 @@
  "idx": 146,
  "is_submittable": 1,
  "links": [],
- "modified": "2021-09-28 13:10:09.761714",
+ "modified": "2021-10-08 14:29:13.428984",
  "modified_by": "Administrator",
  "module": "Stock",
  "name": "Delivery Note",