[SX126x] Fixed incorrect example (#50)

examples/SX126x/SX126x_Receive_Interrupt/SX126x_Receive_Interrupt.ino

@@ -110,6 +110,9 @@ void loop() {
     // reset flag
     receivedFlag = false;
 
+    // put module to standby while reading data
+    lora.standby();
+
     // you can read received data as an Arduino String
     String str;
     int state = lora.readData(str);
@@ -149,6 +152,9 @@ void loop() {
 
     }
 
+    // put module back to listen mode
+    lora.startReceive();
+
     // we're ready to receive more packets,
     // enable interrupt service routine
     enableInterrupt = true;