fix: ifdef condition

src/WebSerial.cpp

@@ -127,7 +127,7 @@ size_t WebSerialClass::write(uint8_t m) {
   // We do not support non-buffered write on webserial for the HIGH_PERF version
   // we fail with a stack trace allowing the user to change the code to use write(const uint8_t* buffer, size_t size) instead
   if(!_initialBufferCapacity) {
-#ifdef defined(ESP8266)
+#if defined(ESP8266)
     ets_printf("Non-buffered write is not supported. Please use write(const uint8_t* buffer, size_t size) instead.");
 #elif defined(ESP32)
     log_e("Non-buffered write is not supported. Please use write(const uint8_t* buffer, size_t size) instead.");