fix: force reload custom field doctype (#27909)

custom_field.json has the same modified key in both versions but not the same content. This can happen again if something is backported, safe solution is to force reload.
diff --git a/erpnext/patches/v13_0/update_vehicle_no_reqd_condition.py b/erpnext/patches/v13_0/update_vehicle_no_reqd_condition.py
index 69bfaaa..902707b 100644
--- a/erpnext/patches/v13_0/update_vehicle_no_reqd_condition.py
+++ b/erpnext/patches/v13_0/update_vehicle_no_reqd_condition.py
@@ -2,7 +2,7 @@
 
 
 def execute():
-	frappe.reload_doc('custom', 'doctype', 'custom_field')
+	frappe.reload_doc('custom', 'doctype', 'custom_field', force=True)
 	company = frappe.get_all('Company', filters = {'country': 'India'})
 	if not company:
 		return