antsAI local optimizations are not consistent with different search parameters

This is because the ITK optimizer does not reset its learning rate between start points. Discovered by @spinicist :

https://discourse.itk.org/t/unexpected-behaviour-in-multistartoptimizerv4/7466

ITK fix submitted:

https://github.com/InsightSoftwareConsortium/ITK/pull/5284
