FindwxWidgets: Find wxQt debug libraries

Extend the change from commit fe54989fcd (FindwxWidgets: Add support for
wxQt, 2019-11-12, v3.16.0-rc4~12^2~1) to also find debug-enabled libs.

Modules/FindwxWidgets.cmake

@@ -517,6 +517,7 @@ if(wxWidgets_FIND_STYLE STREQUAL "win32")
       find_path(wxWidgets_LIB_DIR
         NAMES
           qtu/wx/setup.h
+          qtud/wx/setup.h
           msw/wx/setup.h
           mswd/wx/setup.h
           mswu/wx/setup.h
@@ -543,6 +544,7 @@ if(wxWidgets_FIND_STYLE STREQUAL "win32")
       find_path(wxWidgets_LIB_DIR
         NAMES
           qtu/wx/setup.h
+          qtud/wx/setup.h
           msw/wx/setup.h
           mswd/wx/setup.h
           mswu/wx/setup.h