Use quotes, not angle brackets, for wx header in svg sample

Samples are part of wxWidgets and use quotes for including wx headers to
indicate that they're part of the same tree and not global headers, so just
follow the same convention here.

samples/svg/svgtest.cpp

@@ -26,7 +26,7 @@
 #endif
 
 #include "wx/dcsvg.h"
-#include <wx/notebook.h>
+#include "wx/notebook.h"
 
 #include "SVGlogo24.xpm"