Include wx/textctrl.h according to precompiled headers of wx/wx.h (with other minor cleaning).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39583 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/helpwnd.cpp

@@ -36,12 +36,12 @@
     #include "wx/menu.h"
     #include "wx/settings.h"
     #include "wx/msgdlg.h"
+    #include "wx/textctrl.h"
 #endif // WXPRECOMP
 
 #include "wx/html/helpfrm.h"
 #include "wx/html/helpdlg.h"
 #include "wx/html/helpctrl.h"
-#include "wx/textctrl.h"
 #include "wx/notebook.h"
 #include "wx/imaglist.h"
 #include "wx/treectrl.h"