fix: correct error message (#23746) (#23748)

[skip ci]

(cherry picked from commit 7edb80b)

Co-authored-by: Ankush Menat <ankush@frappe.io>

frappe/custom/doctype/custom_field/custom_field.py

@@ -356,7 +356,7 @@ def rename_fieldname(custom_field: str, fieldname: str):
 	if field.is_system_generated:
 		frappe.throw(_("System Generated Fields can not be renamed"))
 	if frappe.db.has_column(parent_doctype, fieldname):
-		frappe.throw(_("Can not rename as fieldname {0} is already present on DocType."))
+		frappe.throw(_("Can not rename as column {0} is already present on DocType.").format(fieldname))
 	if old_fieldname == new_fieldname:
 		frappe.msgprint(_("Old and new fieldnames are same."), alert=True)
 		return