Fix inconsistent #include style

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
diff --git a/clients/desktop-shell.c b/clients/desktop-shell.c
index adf3a5c..3cca520 100644
--- a/clients/desktop-shell.c
+++ b/clients/desktop-shell.c
@@ -32,11 +32,11 @@
 #include <sys/wait.h>
 #include <linux/input.h>
 
-#include "wayland-client.h"
+#include <wayland-client.h>
 #include "cairo-util.h"
 #include "window.h"
 
-#include <desktop-shell-client-protocol.h>
+#include "desktop-shell-client-protocol.h"
 
 struct desktop {
 	struct display *display;