SampleNode: Remove PURE annotation.

[Mugen87]

Related issue: #31287

Description

@sunag Rollup complains about a PURE annotation in SampleNode. It seems putting the annotation right before an inline function has no effect.

[ROLLUP] (!) src/nodes/utils/SampleNode.js (81:22): A comment
[ROLLUP] 
[ROLLUP] "/*@__PURE__*/"
[ROLLUP] 
[ROLLUP] in "src/nodes/utils/SampleNode.js" contains an annotation that Rollup cannot interpret due to the position of the comment. The comment will be removed to avoid issues.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	337.57 78.74	337.57 78.74	+0 B +0 B
WebGPU	556.48 154.12	556.48 154.12	+0 B +0 B
WebGPU Nodes	555.83 153.96	555.83 153.96	+0 B +0 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	468.76 113.39	468.76 113.39	+0 B +0 B
WebGPU	632.23 171.12	632.23 171.12	+0 B +0 B
WebGPU Nodes	587.28 160.42	587.28 160.42	+0 B +0 B