Remove self includes in some files

modules/navigation/nav_agent.h

@@ -31,7 +31,6 @@
 #ifndef NAV_AGENT_H
 #define NAV_AGENT_H
 
-#include "nav_agent.h"
 #include "nav_rid.h"
 
 #include "core/object/class_db.h"

scene/resources/world_2d.h

@@ -32,7 +32,6 @@
 #define WORLD_2D_H
 
 #include "core/io/resource.h"
-#include "scene/resources/world_2d.h"
 #include "servers/physics_server_2d.h"
 
 class VisibleOnScreenNotifier2D;

servers/rendering/rendering_device.h

@@ -39,7 +39,6 @@
 #include "core/templates/rid_owner.h"
 #include "core/variant/typed_array.h"
 #include "servers/display_server.h"
-#include "servers/rendering/rendering_device.h"
 #include "servers/rendering/rendering_device_commons.h"
 #include "servers/rendering/rendering_device_driver.h"
 #include "servers/rendering/rendering_device_graph.h"