COMP: Provide prefix-less member name to itkPrintSelfObjectMacro

Provide prefix-less member name as the argument to the
`itkPrintSelfObjectMacro` macro in
`itkGPUPDEDeformableRegistrationFilter.hxx`.

Introduced inadvertently in commit c47ed1c.

Modules/Registration/GPUPDEDeformable/include/itkGPUPDEDeformableRegistrationFilter.hxx

@@ -141,7 +141,7 @@ GPUPDEDeformableRegistrationFilter<TFixedImage, TMovingImage, TDisplacementField
     os << "(null)" << std::endl;
   }
 
-  itkPrintSelfObjectMacro(m_GPUImageSizes);
+  itkPrintSelfObjectMacro(GPUImageSizes);
 
   os << indent << "SmoothDisplacementFieldGPUKernelHandle: " << m_SmoothDisplacementFieldGPUKernelHandle << std::endl;
 }