COMP: fix compile errors by aggressive code cleanup

The errors were introduced by 89a7300.

/home/runner/work/Ex/src/Filtering/LabelMap/ShapeAttributesForBinaryImage/Code.cxx: In function 'int main(int, char**)':
/home/runner/work/Ex/src/Filtering/LabelMap/ShapeAttributesForBinaryImage/Code.cxx:48:16: error: 'argv' was not declared in this scope
     fileName = argv[1];
                ^~~~

../src/Filtering/Thresholding/DemonstrateThresholdAlgorithms/Code.cxx:52:0: error: unterminated #ifdef

src/Filtering/LabelMap/ShapeAttributesForBinaryImage/Code.cxx

@@ -25,7 +25,7 @@ static void
 CreateImage(TImage * image);
 
 int
-main(int argc, char *[])
+main(int argc, char * argv[])
 {
   constexpr unsigned int Dimension = 2;
   using PixelType = unsigned char;

src/Filtering/Thresholding/DemonstrateThresholdAlgorithms/Code.cxx

@@ -56,7 +56,6 @@ main(int argc, char * argv[])
 
   const auto input = itk::ReadImage<InputImageType>(argv[1]);
 
-#  ifdef ENABLE_QUICKVIEW
   using OutputPixelType = unsigned char;
   using OutputImageType = itk::Image<OutputPixelType, 2>;
 
@@ -112,8 +111,8 @@ main(int argc, char * argv[])
 
 
   viewer.Visualize();
-#  else
+#else
   std::cout << " Example requires compilation with ENABLE_QUICKVIEW defined." << std::endl;
-#  endif
+#endif
   return EXIT_SUCCESS;
 }