Fix HiddenConstructors warnings

[kl0tl]

Exported types with hidden constructors but Generic or Newtype instances will trigger a warning in v0.14.0.

See purescript/purescript#3907.

[JordanMartinez]

CI is failing with this warning that was converted into an error:

[1/1 UnusedExplicitImport] src/Web/HTML/Window.purs:43:1

  43  import Prelude (class Eq, class Ord, Unit, (<$>), (<<<), map)

      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  

  The import of module Prelude contains the following unused references:

  

    (<<<)

    map

  

  It could be replaced with:

  

    import Prelude (class Eq, class Ord, Unit, (<$>))

           Src   Lib   All

Warnings   0     0     0  

Errors     1     0     1  

* ERROR: Subcommand terminated with exit code 1

The command "npm run -s build" exited with 1.

[JordanMartinez]

Otherwise, LGTM!

[kl0tl]

I removed the unused explicit imports, thank you for noticing the error Jordan !

[JordanMartinez]

CI passes now, but I can't merge this.