Screen fog stays on the canopy when the field of view is widened

[innerhat-dev]

Summary

• At a field of view other than the stock angle, the screen fog redraw could pass the depth test where it had slid onto the sky, so the fog sat beside the branches. It now matches the depth already drawn. The stock angle still uses the original depth test, so that picture is unchanged.

Test plan

• On 343 Guilty Spark, set the field of view wider than the default and look up through the canopy. The fog sits on the branches, not in a second set beside them.
• At the default field of view, the same view matches the fog from before this change.
• Host a match and repeat both checks. Join that match and repeat them.