Fixed typo in quaternion multiplication

[roymacdonald]

This is the fix for #9006

There is a typo in the p5.Quat multiplication;
In line https://github.com/processing/p5.js/blob/main/src/webgl/p5.Quat.js#L44 where it reads this.vec.z - quat.vec.z it should be this.vec.z * quat.vec.z. It is just replacing the - for *.
It quite easy to verify agains the textbook quaternion multiplication.
I am not sure about the implications this has in p5, as of how extensively this has afected p5 in general.
Not sure either if there have been other fixes to compesate this error in other places of the math.

[p5-bot]

Continuous Release

CDN link

• https://raw.esm.sh/pr/p5@04c8b58/lib/p5.min.js

Published Packages

• https://pkg.pr.new/p5@04c8b58

Commit hash: 34809c3

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