Replace use of TernaryFunctorImageFilter by use of FunctorImageFilter in ComplexImage

Summary

Replace use of TernaryFunctorImageFilter by use of FunctorImageFilter in ComplexImage module.

Rationale

Avoid using TernaryFunctorImageFilter

Implementation Details

Only affects one test.

Check before merging:

• All discussions are resolved
• At least 2 votes from core developers, no vote.
• The feature branch is (reasonably) up-to-date with the base branch
• Dashboard is green
• Copyright owner has signed the ORFEO ToolBox Contributor License Agreement

changed title from Replace use of TernaryFunctorImageFilter by use of FunctorImageFilter to Replace use of TernaryFunctorImageFilter by use of FunctorImageFilter in ComplexImage

changed the description

Green, merging.

merged

mentioned in commit 61048143

changed milestone to %7.0.0