[FIX] Packaging: Windows: pychart dependency

In 988baeb5, the pychart dependency has been updated for all distributions,
to use the python-chart library available with pip. However, for Windows, this
dependency should stay pychart as we do not use pypi to generate the Windows binary.

setup.py

@@ -87,7 +87,7 @@ def py2exe_options():
                         'PIL',
                         'poplib',
                         'psutil',
-                        'python-chart',
+                        'pychart',
                         'pydot',
                         'pyparsing',
                         'pyPdf',