Fixes UART1 and UART2 default pins for ESP32-S3

Author: SuGlider

cores/esp32/HardwareSerial.cpp

@@ -64,15 +64,15 @@ void serialEvent1(void) {}
 #ifndef RX2
 #if CONFIG_IDF_TARGET_ESP32
 #define RX2 16
-#else
+#elif CONFIG_IDF_TARGET_ESP32S3
 #define RX2 19 
 #endif
 #endif
 
 #ifndef TX2
 #if CONFIG_IDF_TARGET_ESP32
 #define TX2 17
-#else
+#elif CONFIG_IDF_TARGET_ESP32S3
 #define TX2 20
 #endif
 #endif