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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38857 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/pen.cpp

@@ -13,15 +13,15 @@
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
 #ifndef WX_PRECOMP
-#include <stdio.h>
-#include "wx/list.h"
-#include "wx/utils.h"
-#include "wx/app.h"
-#include "wx/pen.h"
+    #include <stdio.h>
+    #include "wx/list.h"
+    #include "wx/utils.h"
+    #include "wx/app.h"
+    #include "wx/pen.h"
 #endif
 
 #include "wx/msw/private.h"