chore(wpcarro/emacs): Drop support for lsp-haskell

1. This is spamming my Emacs's *Warnings* buffer on init.
2. I recall this being buggy.
3. I'm not doing active Haskell development at the moment.
4. I'd prefer code-intelligence efforts be put into SourceGraph.

Change-Id: I57ba28ec0b2fa3607cd67261a90d134107166c47
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4610
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI

users/wpcarro/emacs/default.nix

@@ -102,7 +102,6 @@ let
       fish-mode
       tuareg
       haskell-mode
-      lsp-haskell
       use-package
       general
       clojure-mode