Removed self-references from VFXTransformBinder

[vertxxyz]

Purpose of this PR

https://forum.unity.com/threads/issue-vfxtransformbinder-redundantly-accesses-transform.1122433/

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Testing status

Nothing required.

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Comments to reviewers

I'm not sure if a change this small warrants a changelog entry, and this is my first PR to this repo so please let me know if I'm targeting the wrong branch, etc. as ya'll have a lot going on :)

[github-actions]

Hi! This comment will help you figure out which jobs to run before merging your PR. The suggestions are dynamic based on what files you have changed.
Link to Yamato: https://yamato.cds.internal.unity3d.com/jobs/902-Graphics
Search for your PR branch using the sidebar on the left, then add the following segment(s) to the end of the URL (you may need multiple tabs depending on how many packages you change)

VFX
/.yamato%252Fall-vfx.yml%2523PR_VFX_2021.2

Depending on the scope of your PR, you may need to run more jobs than what has been suggested. Please speak to your lead or a Graphics SDET (#devs-graphics-automation) if you are unsure.