WebGPURenderer: Use correct invalidation array in WebGL backend.

[cabanier]

We weren't setting up the invalidation array correctly. The depth style was added too many times when there were multiple render targets.

We also weren't passing the invalidation array at the correct time yet. It should be used after the renderbuffers are re-attached.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	337.54 78.73	337.54 78.73	+0 B +0 B
WebGPU	555.33 153.71	555.14 153.68	-187 B -24 B
WebGPU Nodes	554.68 153.55	554.49 153.53	-187 B -24 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	468.74 113.38	468.74 113.38	+0 B +0 B
WebGPU	630.33 170.47	630.15 170.44	-187 B -25 B
WebGPU Nodes	585.18 159.81	585 159.78	-187 B -25 B