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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38945 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/motif/window.cpp

@@ -29,13 +29,13 @@
 #ifndef WX_PRECOMP
     #include "wx/hash.h"
     #include "wx/log.h"
+    #include "wx/app.h"
 #endif
 
 #include "wx/menu.h"
 #include "wx/dc.h"
 #include "wx/dcclient.h"
 #include "wx/utils.h"
-#include "wx/app.h"
 #include "wx/layout.h"
 #include "wx/button.h"
 #include "wx/settings.h"