fix RP2040 ADCEngine stop - #259

Author: Richard Unger

src/current_sense/hardware_specific/rp2040/rp2040_mcu.cpp

@@ -241,6 +241,7 @@ void RP2040ADCEngine::start() {
 
 void RP2040ADCEngine::stop() {
     adc_run(false);
+    irq_set_enabled(DMA_IRQ_0, false);
     dma_channel_abort(readDMAChannel);
     // if (triggerPWMSlice>=0)
     //     dma_channel_abort(triggerDMAChannel);