wled.cpp: Wrap Serial calls in #ifdef WLED_ENABLE_ADALIGHT. (#2630)

handleImprovPacket() unconditionally gobbles serial data which a problem
if we want another feature to consume it. This patch uses the same guard
as the existing call in `handleSerial()`.

Co-authored-by: Thomas Fubar <FUB4R@users.noreply.github.com>

wled00/wled.cpp

@@ -389,7 +389,9 @@ void WLED::setup()
     sprintf(mqttClientID + 5, "%*s", 6, escapedMac.c_str() + 6);
   }
 
+#ifdef WLED_ENABLE_ADALIGHT
   if (Serial.available() > 0 && Serial.peek() == 'I') handleImprovPacket();
+#endif
 
   strip.service();
 
@@ -409,7 +411,10 @@ void WLED::setup()
   initDMX();
 #endif
 
+#ifdef WLED_ENABLE_ADALIGHT
   if (Serial.available() > 0 && Serial.peek() == 'I') handleImprovPacket();
+#endif
+
   // HTTP server page init
   initServer();