[Microbit-Python] Slowness as integers move beyond 256

[M.-A. Lemburg]

I've fixed the logic for calculating the argument for math.sin()
to always be in the range of 0..2*pi. This makes the slowness
go away.

BTW: I tried to film the waves display, but found that the LEDs
appear to be using pulse-width modulation (PWM) to output different
brightness levels. As a result the film doesn't show the nice modulation,
but instead a more or less erratic blinking.

Cheers,
-- 
Marc-Andre Lemburg
eGenix.com

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