Update ydb/core/mon/mon.cpp

Co-authored-by: Alexey Efimov <xeno@prnwatch.com>

Author: StekPerepolnen

ydb/core/mon/mon.cpp

@@ -1030,7 +1030,7 @@ class THttpMonAuthorizedActorRequest : public TActorBootstrapped<THttpMonAuthori
     TMon::TRequestAuthorizer Authorizer;
     NHttp::TEvHttpProxy::TEvSubscribeForCancel::TPtr CancelSubscriber;
 
-    THttpMonAuthorizedActorRequest(NHttp::TEvHttpProxy::TEvHttpIncomingRequest::TPtr event, TMon::TRegisterHandlerFields& fields, TMon::TRequestAuthorizer authorizer)
+    THttpMonAuthorizedActorRequest(NHttp::TEvHttpProxy::TEvHttpIncomingRequest::TPtr event, const TMon::TRegisterHandlerFields& fields, TMon::TRequestAuthorizer authorizer)
         : Event(std::move(event))
         , Fields(fields)
         , Authorizer(std::move(authorizer))