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

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39310 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/x11/font.cpp

@@ -34,12 +34,12 @@
 #ifndef WX_PRECOMP
     #include "wx/string.h"
     #include "wx/utils.h"       // for wxGetDisplay()
+    #include "wx/settings.h"
 #endif
 
 #include "wx/gdicmn.h"
 #include "wx/fontutil.h"    // for wxNativeFontInfo
 #include "wx/tokenzr.h"
-#include "wx/settings.h"
 
 #include "wx/x11/private.h"