Fix for bug with normal depth rendering

[unity-cchu]

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Purpose of this PR

This fixes issues where normal maps had no depth/stencil when specified by the 2D Renderer settings.

https://fogbugz.unity3d.com/f/cases/1259874/

https://yamato.cds.internal.unity3d.com/jobs/902-Graphics/tree/2d%252FFix-for-normal-depth-rendering/.yamato%252Fall-urp_2d.yml%2523PR_URP_2D_trunk/7866312/job

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