GitLab

* fix: allow requests from electron renderer

The Electron Renderer process runs in an embedded  browser window so
has access to browser-native `fetch`.  If this is used by
`ipfs-http-client` to make requests against the HTTP API, the
`User-Agent` header is set to a value that looks similar to a browser
but no `Origin` or `Referer` headers are sent.

The change here is to relax the user agent check to allow through
requests from clients with `'Electron'` in their user agents.