Liquidsoap is trying to connect to stream even though stream is disabled

Config is set to stream_0="false", hence no connection to Icecast should be established.

The logs indicate it is trying to connect though:

2023/03/21 11:10:23 [out_http_0:3] Connecting mount aura-radio.ogg for source@stream.foo.bar...
2023/03/21 11:10:23 [out_http_0:2] Connection failed: 403, Forbidden (HTTP/1.0)
2023/03/21 11:10:23 [lang:3] 403, Forbidden (HTTP/1.0)