fix missing stdio param

[zbirenbaum]

add --stdio to end of command. Having some trouble with getting completions to appear even though executable is running so may have to revert #372

[zbirenbaum]

@AntoineGS Do you use the autosuggestion or copilot-cmp at all. I'm not getting completions even with this fix

It's working but sometimes not on the first buffer. If the attach pr fixes let's prioritize that one

[AntoineGS]

Hmm it seems to work on the first buffer but only after writing some text.
I'll see if that's a new behavior or not and investigate.

Edit: It seems to be the same across version, older and the ones in my PRs.
Sometimes is takes a few keys to trigger, sometimes it works right away, it might be that the server takes a few seconds to start sending suggestions.