main.cpp: bugfix lowpower gpio pin init

src/main.cpp

@@ -184,7 +184,7 @@ void setup() {
 
 // set low power mode to off
 #ifdef HAS_LOWPOWER_SWITCH
-  pinMode(HAS_LED, OUTPUT);
+  pinMode(HAS_LOWPOWER_SWITCH, OUTPUT);
   digitalWrite(HAS_LOWPOWER_SWITCH, HIGH);
   strcat_P(features, " LPWR");
 #endif