Spaces are added to imports of operators which start with `#`

The following line

```haskell
import Foo ((#|), (#%), (|#), (%#))
```

is formatted by stylish-haskell as follows:

```haskell
import Foo (( #% ), ( #| ), (%#), (|#))
```

This probably has something to do with `-XMagicHash`, even though `-XMagicHash` isn't enabled anymore.