Doesn't work with `code-server` (SSH w/o a display)

[massung]

Unable to init server: Could not connect: Connection refused
Gtk initialization failed for display ":0"
  context...:
   body of "/home/jeff/racket/share/pkgs/gui-lib/mred/private/wx/gtk/queue.rkt"
   body of "/home/jeff/racket/share/pkgs/gui-lib/mred/private/wx/platform.rkt"

Additional context

This is running on a Digital Ocean droplet, which has no display. I connect to VS Code using code-server. I wouldn't think that a display is necessary to use the language server.

[samdphillips]

Known issue #45.