Remove LED_INVERTED, see below for why ;-) (#4382)

While working on #4378 I noticed a funny problem: the blinking system
LED was on during deep-sleep.  Initially I thought it was some weird
sleep hw config thing but it turns out it was easier but more pervasive.

We had two different preprocessor symbols which both meant approximately the same
thing LED_INVERTED and LED_STATE_ON (though their polarity was opposite).
Some variant files were setting one, others were setting the other, and others were
setting both. heh.

In the case of the board I was testing (seeed tracker wio 1100) it was only setting one
and the default behavior for the other (for all boards) was incorrect.  So I did a grep
and it seems like LED_STATE_ON was used more often, so I kept that one and removed
LED_INVERTED everywhere.

src/main.cpp

@@ -583,7 +583,7 @@ void setup()
 
 #ifdef LED_PIN
     pinMode(LED_PIN, OUTPUT);
-    digitalWrite(LED_PIN, 1 ^ LED_INVERTED); // turn on for now
+    digitalWrite(LED_PIN, LED_STATE_ON); // turn on for now
 #endif
 
     // Hello
@@ -728,7 +728,7 @@ void setup()
 #ifdef LED_PIN
     // Turn LED off after boot, if heartbeat by config
     if (config.device.led_heartbeat_disabled)
-        digitalWrite(LED_PIN, LOW ^ LED_INVERTED);
+        digitalWrite(LED_PIN, HIGH ^ LED_STATE_ON);
 #endif
 
 // Do this after service.init (because that clears error_code)