Tidy: revert `flt` to `ftl` As was explained here https://github.com/rust-lang/rust/pull/147191#issuecomment-3353801210, this reverting this change because `flt` is incorrect format Also maybe there is existed PR for that? I didn't found one Follow up https://github.com/rust-lang/rust/pull/147191 cc `@GuillaumeGomez`