TSL: Fix optional Fn parameters

[sunag]

Fixes #30876

Description

This PR fixed the function call when all function parameters are optional, thus enabling the possibility of calling this function without parameters as described in the fixed issue for example.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	336.49 78.38	336.49 78.38	+0 B +0 B
WebGPU	542.03 150.13	542.05 150.14	+22 B +5 B
WebGPU Nodes	541.5 150.03	541.52 150.03	+22 B +6 B

🌳 Bundle size after tree-shaking

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

	Before	After	Diff
WebGL	465.42 112.22	465.42 112.22	+0 B +0 B
WebGPU	614.87 166.18	614.9 166.18	+22 B +5 B
WebGPU Nodes	569.86 155.58	569.88 155.59	+22 B +6 B