Default Schema Values don't trigger Rules on Init

[d4hines]

Hello, I'm very excited to use this library - it's really going to help me get a handle on form state.

I did notice that when I pass in a default value through the schema itself, the rules don't take those values into account (perhaps they fire before the defaults are initialized?).

I've provided a minimal example on StackBlitz: https://stackblitz.com/edit/react-jsonschema-form-conditionals-inital-state

I noticed passing in initial state into formData results in the intended behavior, so that's what I'll do (which, in the broader scope of an application, probably makes more sense anyway), but I thought the current behavior may be a bug.

Many thanks!