ch_submit() bug for GitHub Copilot

[mpthomson]

So excited to start using the GitHub Copilot added in #71 - thanks for the great work!

While trying to play with the version on main, I hit a snag:

1. Start the app (successful):
   
2. Enter text -> Submit -> Fails

> chattr::chattr_app()
• Provider: GitHub - Copilot Chat
• Path/URL: https://api.githubcopilot.com/chat/completions
• Model:

Listening on http://127.0.0.1:5576
<callr_error/rlib_error_3_0/rlib_error/error>
Error: 
! in callr subprocess.
Caused by error in `UseMethod("ch_submit")`:
! no applicable method for 'ch_submit' applied to an object of class "c('ch_github_copilot_chat', 'ch_github', 'ch_model')"
---
Subprocess backtrace:
1. chattr::ch_submit(defaults = do.call(what = chattr::chattr_defaults, …
2. base::.handleSimpleError(function (e) …
3. global h(simpleError(msg, call))
Warning: Error in observe: Streaming returned error
  51: <Anonymous>
  50: signalCondition
  49: signal_abort
  48: abort
  47: observe
  46: <observer>
   3: shiny::runApp
   2: runGadget
   1: chattr::chattr_app

[edgararuiz]

Weird, the object should be named ch_openai_github_copilot_chat, can you resintall and try again?

[mpthomson]

Ah, yes! It's resolved after 0d477fc. thank you!