COMP: Fix 'itkPyCommand.h' file not found

This is appearing again, which means that previous solution was not thorough enough:
InsightSoftwareConsortium#4829

Sample error message:

28>------ Build started: Project: ITKPyUtilsCastXML, Configuration: RelWithDebInfo x64 ------
28>Generating ../../../castxml_inputs/itkPyCommand.xml
28>C:/Dev/ITK-py22/Wrapping/castxml_inputs/itkPyCommand.cxx:16:10: fatal error: 'itkPyCommand.h' file not found
28>   16 | #include "itkPyCommand.h"
28>      |          ^~~~~~~~~~~~~~~~
28>1 error generated.

Wrapping/Generators/Python/PyUtils/itkPyCommand.wrap

@@ -1 +1,2 @@
+itk_wrap_include("${CMAKE_CURRENT_LIST_DIR}/itkPyCommand.h")
 itk_wrap_simple_class("itk::PyCommand" POINTER)