Update to 3-Phase PLL sketch

From my point of view, it’s immaterial. I’m happy to be responsible for the version I publish, once a third party makes a change of any sort, responsibility passes to them. The GitHub version was put there by @Simsala, then Dan Bates made a change - a very poorly thought out change - that I could not agree to, so he’s now responsible for that version.

[Moved as the question was off-topic - nothing to do with the operation of the sketch.]