rawHomeserverUrl should default to homeserverUrl if not provided

Currently `rawHomeserverUrl` will default to `127.0.0.1:8008` if not provided, even if a homeserverUrl is. This is troublesome, because if you want to enable event reporting but aren't configuring pantalaimon, things will break.

Start by locating the configuration entry point that handles rawHomeserverUrl and homeserverUrl, then trace how event reporting uses the resulting values when pantalaimon is not configured. Done means rawHomeserverUrl follows homeserverUrl when omitted, while the existing default remains available when neither is provided.

Written by the indexing model from the issue text.