BMP280_I2C_ADDR constant is not used anywhere in the code

[marianomd]

I have a faulty onboard BMP280 barometer, and I added an external BMP280 to the i2c bus.

These BMP280 barometers allow to change the default 0x76 address to 0x77, applying VCC to SDO pin.

In lack of configurable baro_i2c_address (It would be nice to port from Betaflight), I tried to change the default address in the code, but found that it is ignored.

I had to add the following line to barometer_bmp280.c: (last line)

`
bool bmp280Detect(baroDev_t *baro)
{
baro->busDev = busDeviceInit(BUSTYPE_ANY, DEVHW_BMP280, 0, OWNER_BARO);
if (baro->busDev == NULL) {
return false;
}

busSetSpeed(baro->busDev, BUS_SPEED_STANDARD);
baro->busDev->busdev.i2c.address = BMP280_I2C_ADDR;

`
This way I can use the external one without having to desolder the faulty one.

If there is interest I could try to make it configurable.

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