Minor changes example builtin scene

OpenGLEngine/MyBuiltinCubeScene.cpp

@@ -14,6 +14,7 @@ MyBuiltinCubeScene::MyBuiltinCubeScene(Application& application)
 	m_camera(m_screen_size),
 	m_batch(add_batch(&m_shape, 2))
 {
+	add_prerenderable(&m_camera);
 	set_camera(&m_camera);
 }
 

OpenGLEngine/MyBuiltinCubeScene.h

@@ -1,7 +1,7 @@
 #pragma once
 
 #include "BasicScene.h"
-#include "Camera2D.h"
+#include "BuiltinCamera2D.h"
 
 using namespace charcoal;
 using namespace charcoal::builtin;
@@ -14,6 +14,6 @@ public:
 	void update(float delta_time, clock_t clock) override;
 private:
 	BasicRenderable m_shape;
-	Camera2D m_camera;
+	builtin::Camera2D m_camera;
 	BasicBatch& m_batch;
 };