make sure to use node on js file

[Chanakan5591]

A very simple fix for this to work on Windows. Since windows don't understand shebang, we need to make sure it use node from the Path environment variable. (There might be a better way to do this but I'm pretty new to Lua)

[zbirenbaum]

Technically I already implemented (and later fixed!) overriding the command so that windows users can do so, but since passing node as an additional arg works fine on all systems I'll just do that without a check. While normally I am happy to take contributions, to be honest the code here is a bit redundant and the fix is pretty easy so I'll just merge it myself. Thank you for pointing this out to me though, and I wish you luck learning lua!

Just for your reference, if the check were necessary the way you would probably want to do this is just by changing the main statement to be the following:

M.merge_server_opts = function (params)
  return vim.tbl_deep_extend("force", {
    cmd = {
        vim.fn.has("win32") and "node" or nil,
        require("copilot.util").get_copilot_path(params.plugin_manager_path)
    },
    name = "copilot",
    trace = "messages",
    root_dir = vim.loop.cwd(),
    autostart = true,
    on_init = function(_, _)
      vim.schedule(M.buf_attach_copilot)
      vim.schedule(register_autocmd)
    end,
    on_attach = function()
      vim.schedule_wrap(params.on_attach())
    end,
  }, params.server_opts_overrides or {})
end

[Chanakan5591]

I learnt new thing about lua today, thanks for that :D