AddBuilds: fix declarative jobsets with dynamic runcommand enabled

$project->{enable_dynamic_run_command} is undefined

src/lib/Hydra/Helper/AddBuilds.pm

@@ -67,7 +67,7 @@ sub validateDeclarativeJobset {
     my $enable_dynamic_run_command = defined $update{enable_dynamic_run_command} ? 1 : 0;
     if ($enable_dynamic_run_command
         && !($config->{dynamicruncommand}->{enable}
-            && $project->{enable_dynamic_run_command}))
+            && $project->enable_dynamic_run_command))
     {
         die "Dynamic RunCommand is not enabled by the server or the parent project.";
     }