Fixed typo in method

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[SatishGodaPearl]

I am checking with my higher-ups regarding their permission. As soon as that is cleared, I will update this PR comment.

Thank you.

Satish Goda Technical Director Pearl Studio LLC

[SatishGodaPearl]

This seems to be fixed in https://github.com/googlevr/tilt-brush-toolkit/commit/0c6028925f35126bb73e6f174135a0d12a151327

Closing this request.

Thank you @dubois for fixing it :)