Invalid values for arguments are not handled properly

Using an invalid bin name `a` for `cargo-fixit` gives the incorrect suggestion to used `--broken-code`
```sh
$ cargo fix --bin a
error: no bin target named `a` in default-run packages
help: available bin targets:
    typos
$ cargo fixit --bin a
note: try using `--broken-code` to fix errors
error: could not compile
```

Affecting the flags which are directly passed onto `cargo check`