Add haskell-language-server-wrapper --lsp to default languages.toml

After the changes to upgrade and reenable tree-sitter-haskell helix-editor#1417
for the purpose of enabling Haskell syntax highlighting helix-editor#1384, we
might as well take the final step.

languages.toml

@@ -355,7 +355,7 @@ injection-regex = "haskell"
 file-types = ["hs"]
 roots = []
 comment-token = "--"
-
+language-server = { command = "haskell-language-server-wrapper", args = ["--lsp"] }
 indent = { tab-width = 2, unit = "  " }
 
 [[language]]