WebGLShadowMap: Fix wrong camera state.

[Mugen87]

Fixed #31661.

Description

WebGLShadowMap did not correctly delegate the reversedDepth state to the shadow cameras leading to wrong shadow matrices. This wrong matrix was responsible for the incorrect shadow coords and thus the mentioned inconsistent results. Fixing the shadow matrix/shadow coordinates requires some updates in the shader.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	355.49 84.51	355.82 84.56	+336 B +43 B
WebGPU	621.04 172.46	621.04 172.46	+0 B +0 B
WebGPU Nodes	619.64 172.22	619.64 172.22	+0 B +0 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	487.72 119.41	488.06 119.45	+336 B +43 B
WebGPU	691.97 187.85	691.97 187.85	+0 B +0 B
WebGPU Nodes	641.77 175.01	641.77 175.01	+0 B +0 B