fix: cosign keygen may be borked

[xynydev]

Got a report on discord indicating that the keys are undefined

Yes, I tried setting up a "fork" of secureblue using the workshop and during automatic creation the browser dev console reported a wasm error. I'm using trivalent with wasm enabled and jit v8 enabled for workshop.

Edit:

Works in Vanadium

https://github.com/0rootless/test/blob/main/cosign.pub

[xynydev]

Hmm. "It works on my machine"

If there's a WASM error, I guess the user should be notified. But for now, know that if it's broken it's probably your browser.