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/gtk/renderer.cpp

@@ -30,13 +30,12 @@
     #include "wx/window.h"
     #include "wx/dc.h"
     #include "wx/dcclient.h"
+    #include "wx/settings.h"
 #endif
 
 #include <gtk/gtk.h>
 #include "wx/gtk/win_gtk.h"
 
-#include "wx/settings.h"
-
 // RR: After a correction to the orientation of the sash
 //     this doesn't seem to be required anymore and it
 //     seems to confuse some themes so USE_ERASE_RECT=0