HDRenderPipeline: Remove useless bind

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipeline.cs

                 cmd.SetComputeTextureParam(m_applyDistortionCS, m_applyDistortionKernel, HDShaderIDs._DistortionTexture, m_DistortionBufferRT);
                 cmd.SetComputeTextureParam(m_applyDistortionCS, m_applyDistortionKernel, HDShaderIDs._GaussianPyramidColorTexture, m_GaussianPyramidColorBufferRT);
                 cmd.SetComputeTextureParam(m_applyDistortionCS, m_applyDistortionKernel, HDShaderIDs._CameraColorTexture, m_CameraColorBufferRT);
-                cmd.SetComputeTextureParam(m_applyDistortionCS, m_applyDistortionKernel, HDShaderIDs._DepthTexture, GetDepthTexture());
                 cmd.SetComputeVectorParam(m_applyDistortionCS, HDShaderIDs._Size, size);
                 cmd.SetComputeVectorParam(m_applyDistortionCS, HDShaderIDs._ZBufferParams, Shader.GetGlobalVector(HDShaderIDs._ZBufferParams));
                 cmd.SetComputeVectorParam(m_applyDistortionCS, HDShaderIDs._GaussianPyramidColorMipSize, Shader.GetGlobalVector(HDShaderIDs._GaussianPyramidColorMipSize));