Add missing Init() call to one of wxListBox ctors in wxMSW.

Overloaded ctor taking wxArrayString didn't call Init() so the wxListBox
fields were not initialized. Fix it by adding the Init() call.

Closes #12138.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64548 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/listbox.h

@@ -59,6 +59,8 @@ public:
             const wxValidator& validator = wxDefaultValidator,
             const wxString& name = wxListBoxNameStr)
     {
+        Init();
+
         Create(parent, id, pos, size, choices, style, validator, name);
     }