gsdx-d3d11: Remove unused m_rt_ss sampler.

It was removed with old rtCopy DATE code.

plugins/GSdx/Renderers/DX11/GSDevice11.h

@@ -461,7 +461,6 @@ private:
 	CComPtr<ID3D11Buffer> m_ps_cb;
 	std::unordered_map<uint32, CComPtr<ID3D11SamplerState>> m_ps_ss;
 	CComPtr<ID3D11SamplerState> m_palette_ss;
-	CComPtr<ID3D11SamplerState> m_rt_ss;
 	std::unordered_map<uint32, CComPtr<ID3D11DepthStencilState>> m_om_dss;
 	std::unordered_map<uint32, CComPtr<ID3D11BlendState>> m_om_bs;
 

plugins/GSdx/Renderers/DX11/GSTextureFX11.cpp

@@ -77,10 +77,6 @@ bool GSDevice11::CreateTextureFX()
 
 	if(FAILED(hr)) return false;
 
-	hr = m_dev->CreateSamplerState(&sd, &m_rt_ss);
-
-	if(FAILED(hr)) return false;
-
 	// create layout
 
 	VSSelector sel;