UnityTypeContractResolver is still used when "Use Unity Contractor Resolver" is false.

[tomkail]

Using 1.6.3. Assume related to this task?
We noticed that _isDirty on UnityConvertersConfigEditor isn't triggered when setting Use Unity Contract Resolvers, which it should be - but it doesn't seem to matter.

For now we'll uninstall, since it causes critical errors that we can't really work around.