nvim: lua: nvim_lsp: hls: Do not start unless hie.yaml is found

Do not start haskell-language-server unless a hie.yaml file is present
for proper multi-component support.

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/.config/nvim/lua/nvim_lsp/hls.lua

@@ -5,7 +5,7 @@ configs.hls = {
   default_config = {
     cmd = { "haskell-language-server-wrapper", "--lsp" };
     filetypes = { "haskell" };
-    root_dir = util.root_pattern("stack.yaml", "package.yaml", ".git");
+    root_dir = util.root_pattern("hie.yaml");
   };
 };