AP_RangeFinder: fix bus for Lightware on some boards

libraries/AP_RangeFinder/RangeFinder.cpp

@@ -500,7 +500,7 @@ void RangeFinder::detect_instance(uint8_t instance)
     if (type == RangeFinder_TYPE_LWI2C) {
         if (_address[instance]) {
             _add_backend(AP_RangeFinder_LightWareI2C::detect(*this, instance, state[instance],
-                hal.i2c_mgr->get_device(0, _address[instance])));
+                hal.i2c_mgr->get_device(HAL_RANGEFINDER_LIGHTWARE_I2C_BUS, _address[instance])));
         }
     }
 #if CONFIG_HAL_BOARD == HAL_BOARD_PX4  || CONFIG_HAL_BOARD == HAL_BOARD_VRBRAIN