http: On select timeout, error out directly, do not call Die()

The error handling in Die() that's supposed to add useful error
messages is not super useful here.

methods/http.cc

@@ -835,7 +835,7 @@ ResultState HttpServerState::Go(bool ToFile, RequestState &Req)
    if (Res == 0)
    {
       _error->Error(_("Connection timed out"));
-      return Die(Req);
+      return ResultState::TRANSIENT_ERROR;
    }
    
    // Handle server IO