ScreenNode: Fix update type of DPR.

[Mugen87]

Related issue: #31702 (comment)

Description

The PR ensures ScreenNode.DPR has the correct update type.

The node type is also corrected.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	338.91 79.1	338.91 79.1	+0 B +0 B
WebGPU	576.96 159.14	577.01 159.15	+49 B +10 B
WebGPU Nodes	575.57 158.89	575.61 158.9	+49 B +10 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	470.7 113.91	470.7 113.91	+0 B +0 B
WebGPU	647.51 175.1	647.56 175.1	+49 B +6 B
WebGPU Nodes	601.59 164.25	601.64 164.26	+49 B +9 B