Update LoRa.h

Author: d3v1c3nv11

src/LoRa.h

@@ -66,7 +66,7 @@ class LoRaClass : public Stream {
   void idle();
   void sleep();
 
-  void setTxPower(int level, int outputPin = PA_OUTPUT_PA_BOOST_PIN);
+  void setTxPower(int level, int outputPin = PA_OUTPUT_RFO_PIN);
   void setFrequency(long frequency);
   void setSpreadingFactor(int sf);
   void setSignalBandwidth(long sbw);