Extend search_fields for customer querie

This PR is intended to extend the customer querie adding the meta-info from the doctype using the search fields to extend the customer querie
diff --git a/erpnext/controllers/queries.py b/erpnext/controllers/queries.py
index f53ad53..0debe4a 100644
--- a/erpnext/controllers/queries.py
+++ b/erpnext/controllers/queries.py
@@ -85,6 +85,9 @@
 		fields = ["name", "customer_group", "territory"]
 	else:
 		fields = ["name", "customer_name", "customer_group", "territory"]
+		
+	meta = frappe.get_meta("Customer")
+	fields = fields + [f for f in meta.get_search_fields() if not f in fields]
 
 	fields = ", ".join(fields)
 
@@ -364,4 +367,4 @@
 			match_condition=get_match_cond(doctype)), {
 			'company': filters.get("company", ""),
 			'txt': "%%%s%%" % frappe.db.escape(txt)
-		})
\ No newline at end of file
+		})