[nRF24] Fixed missing pinMode for IRQ (#252)

src/modules/nRF24/nRF24.cpp

@@ -10,6 +10,7 @@ int16_t nRF24::begin(int16_t freq, int16_t dataRate, int8_t power, uint8_t addrW
   _mod->SPIreadCommand = NRF24_CMD_READ;
   _mod->SPIwriteCommand = NRF24_CMD_WRITE;
   _mod->init(RADIOLIB_USE_SPI);
+  Module::pinMode(_mod->getIrq(), INPUT);
 
   // set pin mode on RST (connected to nRF24 CE pin)
   Module::pinMode(_mod->getRst(), OUTPUT);