Graphics/RenderTechnique: Remove Clear method

Let's face it, this method was useless from the beginning.


Former-commit-id: c38f57785c900acf66560ad07aa29498312c6063

SDK/src/NDK/Systems/RenderSystem.cpp

@@ -35,7 +35,6 @@ namespace Ndk
 				graphicsComponent.AddToRenderQueue(renderQueue, drawableNode.GetTransformMatrix());
 			}
 
-			m_renderTechnique.Clear(&dummyScene);
 			m_renderTechnique.Draw(&dummyScene);
 		}
 	}