fix(lsp): compare URI instead of workspace folder name (#30962)

The workspace folder name is meant to be a human-readable name which is
only used in the UI. Comparing the name against root_dir is thus not
a valid comparison. Instead, we should compare the workspace folder's
URI against the root dir URI.

runtime/lua/vim/lsp.lua

@@ -189,9 +189,10 @@ local function reuse_client_default(client, config)
   end
 
   if config.root_dir then
+    local root = vim.uri_from_fname(config.root_dir)
     for _, dir in ipairs(client.workspace_folders or {}) do
       -- note: do not need to check client.root_dir since that should be client.workspace_folders[1]
-      if config.root_dir == dir.name then
+      if root == dir.uri then
         return true
       end
     end