TSL: Fix reflector() clear texture and stop update if bounce is false

[sunag]

Description

The PR fixed two issues:

• Clears the texture if it is not in the viewing angle to avoid artifacts generated in the material that is projected.
• If bounce=false and it is not in the viewing angle, reflector() stops working.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	337.26 78.64	337.26 78.64	+0 B +0 B
WebGPU	549.59 152.34	549.71 152.38	+120 B +43 B
WebGPU Nodes	548.94 152.19	549.06 152.23	+120 B +43 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	467.34 112.95	467.34 112.95	+0 B +0 B
WebGPU	624.5 169.06	624.5 169.06	+0 B +0 B
WebGPU Nodes	579.35 158.35	579.35 158.35	+0 B +0 B