Fix recently broken generation of wxEVT_CHAR_HOOK events in wxMSW.

Fix recently broken generation of wxEVT_CHAR_HOOK events in wxMSW.

Changes to VKToWX() semantics broke the logic of the global keyboard hook
function in wxMSW which didn't generate wxEVT_CHAR_HOOK events for ASCII
special keys such as WXK_ESCAPE any more.

Fix this and also generate wxEVT_CHAR_HOOK for all events, not just the
non-ASCII keys for consistency with the documentation and wxGTK.

Closes #12501.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65589 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775