emacs: haskell: better lsp settings
emacs: haskell: better lsp settings

- Turn off the `importLens` plugin, which adds a ton of hints to my
  imports in the editor and looks bad.
- Set the formatting provider to `brittany`.

mjhoy/dotfiles,mjhoy/dotfiles,mjhoy/dotfiles,mjhoy/dotfiles,mjhoy/dotfiles