whisper.wasm : fix unknown language issue (#3000)

whisper.wasm : fix unknown language issue (#3000)

* whisper.wasm : fix unknown language issue

This commit addresses an issue with whisper.wasm where the following
error was being displayed when running the application in github pages:
```
whisper_lang_id: unknown language 'д=␙c'
```

This turned out to be a memory corruption issue and further details
can be found in the reference issue below.

Refs: https://github.com/ggerganov/whisper.cpp/issues/2998