Update npm deps, notably ace-builds to 1.32.3 (was 1.15.0)

Also fixes the error printed in the DevTools console since
a2496ac, which updated `ace-builds` to
1.15.0 (from 1.4.12), but did not update the list of files to copy into
the `lib/_npm/` folder for the new version:

```
Uncaught DOMException: Failed to execute 'importScripts' on 'WorkerGlobalScope':
  The script at 'https://ide.kaitai.io/devel/lib/_npm/ace/worker-yaml.js' failed to load.
```