patch-shebangs: fix `env -S` with only one argument

In case `patchShebangs` encounters an `env -S` interpreter with only one
argument following, it would duplicate that argument and most likely invalidate
the resulting interpreter line.

Reproducer:

```nix
(import <nixpkgs> {}).writeTextFile {
  name = "patch-shebangs-env-s";
  text = ''
    #!/bin/env -S bash
  '';
  executable = true;
  checkPhase = ''
    patchShebangs $out
  '';
}
```

The resulting file would contain

```
#!/nix/store/pw…fk-coreutils-9.5/bin/env -S /nix/store/4f…g60-bash-5.2p37/bin/bash bash
```

instead of the correct

```
#!/nix/store/pw…fk-coreutils-9.5/bin/env -S /nix/store/4f…g60-bash-5.2p37/bin/bash
```

0 files changed, 0 insertions, 0 deletions