ircd:Ⓜ️:vm: Propagate authority for hash mismatch for auth_chain eval.

matrix/vm_fetch.cc

@@ -338,6 +338,12 @@ try
 	opts.infolog_accept = true;
 	opts.warnlog &= ~vm::fault::EXISTS;
 	opts.notify_servers = false;
+
+	// The auth_chain fetch made by the caller won't give us events with
+	// a content hash mismatch unless they were obtained from an authoritative
+	// source. For this we can unconditionally allow hash mismatch from here.
+	opts.redacted = 1;
+
 	log::debug
 	{
 		log, "Evaluating auth chain for %s in %s events:%zu",