BUG: Do not print non-self member variables in PrintSelf

[jhlegarreta]

Do not print non-self member variables in PrintSelf.

Fixes

  CurrentPosition: ITK test driver caught an ITK exception:

itk::ExceptionObject (0x55be11155e70)
Location: "unknown"
File: /home/vsts/work/1/s/Modules/Numerics/Optimizersv4/src/itkObjectToObjectOptimizerBase.cxx
Line: 201
Description: ITK ERROR: LBFGSBOptimizerv4(0x55be11150c00): m_Metric has not been assigned. Cannot get parameters.

raised in:
https://open.cdash.org/test/583682381

PR Checklist

• No API changes were made (or the changes have been approved)
• No major design changes were made (or the changes have been approved)

[jhlegarreta]

#3062 passing relies on this fix.

Also, note that this is the minimum set of changes required to fix the issue, but the itk::LBFGSBOptimizerv4::PrintSelf method is printing many non-self members. Probably other optimization classes are as well, and the issue might involve the related metrics or transforms (e.g. there is no m_CurrentPosition in any superclass or related metrics, except for a few specialized optimizers) . Might have been an effect of the non-v4 classes. It should be should be addressed in a separate PR.

[jhlegarreta]

/azp run ITK.macOS