Redirect mouse wheel events when STC autocomp is active

While an autocompletion list is being shown, a native Scintilla window
will use mouse wheel events to scroll the list instead of the editor
window. Match this behavior with wxSTC by intercepting mouse wheel
events and redirecting them to the list.

src/stc/PlatWX.cpp

@@ -2701,7 +2701,7 @@ wxSTCListBox::wxSTCListBox(wxWindow* parent, wxSTCListBoxVisualData* v, int ht)
               m_textTopGap(0), m_imageAreaWidth(0), m_imageAreaHeight(0)
 {
     wxVListBox::Create(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize,
-                       wxBORDER_NONE);
+                       wxBORDER_NONE, "AutoCompListBox");
 
     m_imagePadding             = FromDIP(1);
     m_textBoxToTextGap         = FromDIP(3);