VoidSW:Fix micro-stuttering

Thanks to CommonLoon102 and mjr4077au for the fix which consists in changing the line smoothratio = min(max(((int32_t) totalclock - ototalclock) * (65536 / synctics),0),65536); to smoothratio = calc_smoothratio (totalclock, ototalclock, 40); in draw.cpp. As described here https://github.com/nukeykt/NBlood/issues/522