BUG: ElastixRegistrationMethod shouldn't put "NoInitialTransform" in map

ElastixRegistrationMethod should not set "NoInitialTransform" as parameter value of `InitialTransformParametersFileName`. The value "NoInitialTransform" might cause confusion, as the registration might still have an initial transform parameter file, specified by `SetInitialTransformParameterFileName`.

With this commit, `ElastixRegistrationMethod` just ignores any such `InitialTransformParametersFileName` parameter, as suggested to me by Marius Staring, during the internal weekly sprint.

Core/Main/itkElastixRegistrationMethod.hxx

@@ -222,10 +222,6 @@ ElastixRegistrationMethod<TFixedImage, TMovingImage>::GenerateData()
 
     SetParameterValueAndWarnOnOverride(parameterMap, "ResultImagePixelType", fixedImagePixelTypeString);
 
-    // Initial transform parameter files are handled via arguments and enclosing loop, not
-    // InitialTransformParametersFileName
-    SetParameterValueAndWarnOnOverride(parameterMap, "InitialTransformParametersFileName", "NoInitialTransform");
-
     // Create new instance of ElastixMain
     const auto elastixMain = elx::ElastixMain::New();
     m_ElastixMain = elastixMain;