BUG: Initialize itk::Array variable values in test

Initialize `itk::Array` variable values in
MultiResolutionImageRegistrationMethod.

Fixes:
```
UMC ==17365== Conditional jump or move depends on uninitialised value(s)
==17365==    at 0x6018484:
vnl_vector::operator_eq(vnl_vector const&) const (vnl_vector.hxx:757)
==17365==    by 0x2D1510:
vnl_vector::operator!=(vnl_vector const&) const (vnl_vector.h:431)
==17365==    by 0x3C92C7:
itk::MultiResolutionImageRegistrationMethod, itk::Image >
::SetInitialTransformParametersOfNextLevel(itk::OptimizerParameters)
(itkMultiResolutionImageRegistrationMethod.h:200)
==17365==    by 0x613AC5:
itkMultiResolutionImageRegistrationMethodTest(int, char**)
(itkMultiResolutionImageRegistrationMethodTest.cxx:139)
==17365==    by 0x2C10E7:
main (ITKRegistrationCommonTestDriver.cxx:417)
```

Raised for example in:
https://open.cdash.org/viewDynamicAnalysisFile.php?id=9067993

Modules/Registration/Common/test/itkMultiResolutionImageRegistrationMethodTest.cxx

@@ -135,7 +135,8 @@ itkMultiResolutionImageRegistrationMethodTest(int, char *[])
   registration->SetInitialTransformParameters(initialParameters);
   ITK_TEST_SET_GET_VALUE(initialParameters, registration->GetInitialTransformParameters());
 
-  ParametersType initialTransformParametersOfNextLevel(1);
+  typename ParametersType::ValueType initialTransformParametersOfNextLevelVal(0.0);
+  ParametersType                     initialTransformParametersOfNextLevel(1, initialTransformParametersOfNextLevelVal);
   registration->SetInitialTransformParametersOfNextLevel(initialTransformParametersOfNextLevel);
   ITK_TEST_SET_GET_VALUE(initialTransformParametersOfNextLevel,
                          registration->GetInitialTransformParametersOfNextLevel());