COMP: Fix compilation issues

Core/Transform/test/itkTransformTest.cxx:224:46: error:
default initialization of an object of const type 'const
itk::itkTransformTestHelpers::TransformTester<double, 3,
3>::InputSymmetricSecondRankTensorType' (aka 'const
SymmetricSecondRankTensor<double, 3U>') without a user-provided default
constructor const InputSymmetricSecondRankTensorType ssrten;
                                                     ^
                                                     {}

Modules/Core/Transform/test/itkTransformTest.cxx

@@ -221,7 +221,7 @@ class TransformTester
     transform->TransformDiffusionTensor3D(vecpix, pnt);
     std::cout << "TransformDiffusionTensor3D()                  OK" << std::endl;
 
-    const InputSymmetricSecondRankTensorType ssrten;
+    const InputSymmetricSecondRankTensorType ssrten{};
     vecpix.SetSize(VInputDimension * VInputDimension);
     vecpix.Fill(0);
     transform->TransformSymmetricSecondRankTensor(ssrten);