test: add default-config-macro smoke test

This uses an AI generated python script to diff the contents of the bots
field of the default configuration file and the
data/meta/default-config.yaml file. It emits a patch showing what needs
to be changed.

Signed-off-by: Xe Iaso <me@xeiaso.net>

lib/anubis_test.go

@@ -194,7 +194,6 @@ func (u *userAgentRoundTripper) RoundTrip(req *http.Request) (*http.Response, er
 	// Only set if not already present
 	req = req.Clone(req.Context()) // avoid mutating original request
 	req.Header.Set("User-Agent", "Mozilla/5.0")
-	req.Header.Set("Accept-Encoding", "gzip")
 	return u.rt.RoundTrip(req)
 }