Pure annotations house cleaning: Fix CatmullRomCurve3 formatting

[pschroen]

Related issue: #24207

@LeviPesin caught a mistake in my formatting of the last PR. See #24207 (comment). 🙏

[LeviPesin]

Can we split this line in three separate like const px = ...; const py = ...; const pz = ...?

[pschroen]

I had originally done that but then changed it to that format after comparing how other cases were handled, most of the pure annotations are in the multiple variable declarations format.

What changed my mind was the rest of that file is also written as single variable declarations, and also here:

three.js/examples/jsm/utils/CameraUtils.js

Line 7 in de17358

const _va = /*@__PURE__*/ new Vector3(), // from pe to pa

Happy to change it to multiple declarations for consistency with the rest of the pure annotations though. 😅

[mrdoob]

Thanks!