Use correct SDA+SCL pins (#996)

ESP8266 uses D1 (5) and D2 (4), ESP32 uses 21 and 22. Both provide defines for SDA and SCL pin numbers though

main/config_BME280.h

@@ -59,7 +59,7 @@ unsigned long timebme280 = 0;
 int BME280_i2c_addr = 0x76; // Bosch BME280 I2C Address
 
 // Only supported for ESP
-int BME280_PIN_SDA = 21; // PIN SDA
+int BME280_PIN_SDA = SDA; // PIN SDA
-int BME280_PIN_SCL = 22; // PIN SCL
+int BME280_PIN_SCL = SCL; // PIN SCL
 
 #endif