Setting prescaler doesn't work on timers

[Mike Purvis]

Seems to be this logic here, that doesn't use the value for anything, instead passing a hard-coded zero:

  template<class TTimer,PeripheralName TPeripheralName>
  inline void TimerPeripheral<TTimer,TPeripheralName>::setPrescalerImmediately(uint16_t value) {
    TIM_PrescalerConfig(*this,0,TIM_PSCReloadMode_Immediate);
  }

https://github.com/andysworkshop/stm32plus/blob/master/lib/include/timer/TimerPeripheral.h#L80-L95

FYI @mikeodr