COMP: Fix missing initialization braces warning

[jhlegarreta]

Fix missing initialization braces warning.

Fixes:

[CTest: warning matched]
/Users/builder/externalModules/Filtering/LabelMap/test/itkLabelImageToLabelMapFilterTest.cxx:29:37:
warning: suggest braces around initialization of subobject [-Wmissing-braces]
  p_image->SetRegions(itk::Size<3>{ 0, 0, 0 });
                                    ^~~~~~~
                                    {      }
[CTest: warning suppressed] 1 warning generated.

and

[CTest: warning matched]
/Users/builder/externalModules/Filtering/ImageFeature/test/itkLaplacianImageFilterTest.cxx:62:36:
warning: suggest braces around initialization of subobject [-Wmissing-braces]
  itk::Vector<float, 2> spacin{ { 0.5, 5.0 } };
                                  ^~~~~~~~
                                  {       }
[CTest: warning suppressed] 1 warning generated.

reported at:
https://open.cdash.org/viewBuildError.php?type=1&buildid=7475017

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]

Looks like #2748 did not make one of the compilers happy.

I am not being able to configure ITK locally due to some CMake error, so I cannot test locally if this compiles (at least on Windows).

@seanm can you please check that this makes happy RogueResearch7 ? Thanks.

[seanm]

That warning is pretty useless, and I've tried to disable it, see here:

https://open.cdash.org/build/7475017/notes

note presence of -Wno-missing-braces. I'm stumped why it doesn't work...

[dzenanz]

Code looks good, but this is about pleasing the compilers 😄

[jhlegarreta]

The CircleCI build is expected to fail due to the know issues in the Review module. Cross-referencing #2567 (comment).