Fixed MIDI audio in web port

[midzer]

Hi,

I've got MIDI audio working in the web port.

Relevant changes at https://github.com/midzer/OpenClaw/tree/emscripten

Have a nice week
midzer

[pjasicek]

Hi, that's awesome !

Could you please create a pull request to the master branch ?

Thanks,
Petr