BUG: Disable ExtensionWizard to avoid crash on Windows

Time the runtime crash happening on Windows is resolved. The module
is disabled.

Details about the crash are reported here:

 http://slicer-devel.65872.n3.nabble.com/Fwd-ctk-build-error-in-slicer-tt4031747.html

To avoid the crash in existing build tree, the following two files
will have to be removed from the build tree:

 lib/Slicer-4.3/qt-scripted-modules/ExtensionWizard.py
 lib/Slicer-4.3/qt-scripted-modules/ExtensionWizard.pyc

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23297 3bd1e089-480b-0410-8dfb-8563597acbee