llamafiler chatbot.js doesn't use url_prefix

[ajbouh]

llamafile/llamafile/server/www/chatbot.js

Line 189 in 508ea3a

const response = await fetch("/v1/chat/completions", {

The current implementation seems to hardcode "/v1/chat/complations". Compare this to the more parameterized one in completion.js:

llamafile/llama.cpp/server/public/completion.js

Line 199 in 508ea3a

const props = await fetch(`${url_prefix}/props`).then(r => r.json());

[sizvix]

And there is some correction todo on url_prefix ( #641 )