Intensity fix for neoscrypt enhancement

[Dealazer]

@KlausT
throughputmax = device_intensity(device_map[thr_id], func, intensity) / 2;
should be:
throughputmax = device_intensity(device_map[thr_id], func, intensity) / 32;

Then intensity problem will be fixed. And are capable of running up to 21+ in intensity.

But I'm unsure if this is real enhancement,

Anyway, I run on 1050Ti 450kh/s OC stable with version 8.12 with neoscrypt from 8.17 and only KlausT neoscrypt version.