Fixing imports

While installing scotty I got

```bash
    Web/Scotty/Types.hs:117:50:
    Ambiguous occurrence `catch'
    It could refer to either `Prelude.catch',
                             imported from `Prelude' at Web/Scotty/Types.hs:2:8-23
                             (and originally defined in `System.IO.Error')
                          or `Control.Exception.catch',
                             imported from `Control.Exception' at Web/Scotty/Types.hs:7:37-41
                             (and originally defined in `Control.Exception.Base')
```

Made the imports qualified and that fixed the issue