Fix inconsistent #include style

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>

compositor/compositor.c

@@ -42,7 +42,7 @@
 #include <getopt.h>
 #include <signal.h>
 
-#include "wayland-server.h"
+#include <wayland-server.h>
 #include "compositor.h"
 
 /* The plan here is to generate a random anonymous socket name and

compositor/compositor.h

@@ -25,7 +25,7 @@
 
 #include <libudev.h>
 #include <pixman.h>
-#include "wayland-server.h"
+#include <wayland-server.h>
 #include "wayland-util.h"
 
 #include <GLES2/gl2.h>

compositor/shell.c

@@ -32,7 +32,7 @@
 #include <fcntl.h>
 #include <assert.h>
 
-#include "wayland-server.h"
+#include <wayland-server.h>
 #include "compositor.h"
 #include "desktop-shell-server-protocol.h"