perf(derive): reduce amount of generated code

[klensy]

Don't generate error string with format!, as there can be used concat!, reducing code size.

Example expanded code (from bindgen-cli) before:

                no_layout_tests: __clap_arg_matches
                    .remove_one::<bool>("no_layout_tests")
                    .ok_or_else(|| clap::Error::raw(
                        clap::error::ErrorKind::MissingRequiredArgument,
                        {
                            let res = ::alloc::fmt::format(
                                format_args!(
                                    "The following required argument was not provided: {0}",
                                    "no_layout_tests"
                                ),
                            );
                            res
                        },
                    ))?,

after:

                no_layout_tests: __clap_arg_matches
                    .remove_one::<bool>("no_layout_tests")
                    .ok_or_else(|| clap::Error::raw(
                        clap::error::ErrorKind::MissingRequiredArgument,
                        "The following required argument was not provided: no_layout_tests",
                    ))?,

This shave off ~10kb for bindgen-cli.

[epage]

Thanks!