Fixed issue that was causing a copyDepth pass to be called even when a depth from prepass is available.

com.unity.render-pipelines.lightweight/LWRP/LightweightForwardRenderer.cs

             bool requiresDepthAttachment = requiresCameraDepth && !requiresDepthPrepass;
             bool requiresColorAttachment = RequiresIntermediateColorTexture(ref renderingData.cameraData, baseDescriptor, requiresDepthAttachment);
             int[] colorHandles = (requiresColorAttachment) ? new[] {RenderTargetHandles.Color} : null;
-            int depthHandle = (requiresColorAttachment) ? RenderTargetHandles.DepthAttachment : -1;
+            int depthHandle = (requiresDepthAttachment) ? RenderTargetHandles.DepthAttachment : -1;
             EnqueuePass(cmd, RenderPassHandles.ForwardLit, baseDescriptor, colorHandles, depthHandle, renderingData.cameraData.msaaSamples);
 
             context.ExecuteCommandBuffer(cmd);