[Fix] User frappe_userid set to read only (#3670)

frappe/core/doctype/user/user.json

@@ -1949,7 +1949,7 @@
    "precision": "", 
    "print_hide": 0, 
    "print_hide_if_no_value": 0, 
-   "read_only": 0, 
+   "read_only": 1, 
    "remember_last_selected_value": 0, 
    "report_hide": 0, 
    "reqd": 0, 
@@ -1971,7 +1971,7 @@
  "istable": 0, 
  "max_attachments": 5, 
  "menu_index": 0, 
- "modified": "2017-05-19 09:12:35.697915", 
+ "modified": "2017-07-12 19:24:00.824902", 
  "modified_by": "Administrator", 
  "module": "Core", 
  "name": "User",