TSL: Export screenDPR

[shotamatsuda]

Description

This PR exports screenDPR from three/tsl, which is presumably supposed to be exported.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.91 79.11	338.91 79.11	+0 B +0 B
WebGPU	579.78 159.79	579.78 159.79	+0 B +0 B
WebGPU Nodes	578.39 159.55	578.39 159.55	+0 B +0 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	470.78 113.9	470.78 113.9	+0 B +0 B
WebGPU	649.44 175.54	649.44 175.54	+0 B +0 B
WebGPU Nodes	603.54 164.69	603.54 164.69	+0 B +0 B

[Mugen87]

Thanks, totally forgot this when adding screenDPR 👍 .