Point filtering for temporary depth RTs.

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipeline.cs

                 depthRTDesc.colorFormat = RenderTextureFormat.Depth;
                 depthRTDesc.depthBufferBits = kDepthStencilBufferBits;
 
-                cmd.GetTemporaryRT(CameraRenderTargetID.depth, depthRTDesc, FilterMode.Bilinear);
+                cmd.GetTemporaryRT(CameraRenderTargetID.depth, depthRTDesc, FilterMode.Point);
-                    cmd.GetTemporaryRT(CameraRenderTargetID.depthCopy, depthRTDesc, FilterMode.Bilinear);
+                    cmd.GetTemporaryRT(CameraRenderTargetID.depthCopy, depthRTDesc, FilterMode.Point);
 
                 m_ShadowPass.InitializeResources(cmd, baseDesc);
             }