haskellPackages.lsp-test: temporarily remove override

This override currently breaks eval, but is probably still necessary in
some form. However the change to fix it is non-trivial and not quickly
actionable as hls-plugins-api currently is broken so the intended target
of the override (haskell-language-server) can't be tested.

Something in a similar spirit would be pinning lsp-test to 0.14.0.0
which would however require to pick this patch from
haskell-language-server master:

6d1f1a55e3

To me this sounds like a promising solution as it also adjusts to lsp
1.2 which we now have in haskellPackages. Supposedly it also fixes some
tests, so maybe we can remove the dontCheck.

cc @maralorn

pkgs/development/haskell-modules/configuration-common.nix

@@ -1413,9 +1413,6 @@ self: super: {
   # 2021-03-19: https://github.com/Avi-D-coder/implicit-hie-cradle/pull/8
   implicit-hie-cradle = doJailbreak super.implicit-hie-cradle;
 
-  # 2021-03-09: Overrides because nightly is to old for hls 1.0.0
-  lsp-test = doDistribute (dontCheck self.lsp-test_0_13_0_0);
-
   # 2021-03-09: Golden tests seem to be missing in hackage release:
   # https://github.com/haskell/haskell-language-server/issues/1536
   hls-tactics-plugin = dontCheck super.hls-tactics-plugin;