Fix inconsistent #include style

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
diff --git a/clients/screenshot.c b/clients/screenshot.c
index 124e576..bfe5ea0 100644
--- a/clients/screenshot.c
+++ b/clients/screenshot.c
@@ -30,7 +30,7 @@
 #include <glib.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
 
-#include "wayland-client.h"
+#include <wayland-client.h>
 #include "screenshooter-client-protocol.h"
 
 /* The screenshooter is a good example of a custom object exposed by