fix(utils): `toCreasedNormals()`: call `toNonIndexed()` only on indexed geometries (#268)

[kpvhn]

Why

BufferGeometryUtils.toCreasedNormals() produces a warning by BufferGeometry.toNonIndexed() if the provided geometry is already non-indexed:

THREE.BufferGeometry.toNonIndexed(): BufferGeometry is already non-indexed.

It should not produce the warning.

resolves #268

What

This changes BufferGeometryUtils.toCreasedNormals() to call BufferGeometry.toNonIndexed() only if the provided geometry is indexed. Otherwise, it will just use the original geometry, as has been the case before: BufferGeometry.toNonIndexed() returns this if the geometry is non-indexed.

Checklist

• [x] Documentation updated
• [x] Ready to be merged

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