Include wx/choicdlg.h, wx/textdlg.h and wx/filedlg.h according to precompiled headers of wx/wx.h (with other minor cleaning).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39651 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/helpwnd.cpp

@@ -38,6 +38,8 @@
     #include "wx/msgdlg.h"
     #include "wx/textctrl.h"
     #include "wx/toolbar.h"
+    #include "wx/choicdlg.h"
+    #include "wx/filedlg.h"
 #endif // WXPRECOMP
 
 #include "wx/html/helpfrm.h"
@@ -52,10 +54,8 @@
 #include "wx/busyinfo.h"
 #include "wx/progdlg.h"
 #include "wx/fontenum.h"
-#include "wx/filedlg.h"
 #include "wx/artprov.h"
 #include "wx/spinctrl.h"
-#include "wx/choicdlg.h"
 
 // what is considered "small index"?
 #define INDEX_IS_SMALL 100