--style seems to be incompatible with -s

If I use -s to request a stylesheet, rather than inline style elements, then the -y/--style option no longer has an effect.  (aha version 0.5.1)

```
$ man aha | aha --style "foo:xyzzy" | grep xyzzy
<body style="foo:xyzzy">
$ man aha | aha -s --style "foo:xyzzy" | grep xyzzy
$ man aha | aha  --style "foo:xyzzy" -s | grep xyzzy

```

Handy program, though!!