Accelerometer: fix thermal calibration index

src/lib/sensor_calibration/Accelerometer.cpp

@@ -111,7 +111,7 @@ void Accelerometer::SensorCorrectionsUpdate(bool force)
 						_thermal_offset = Vector3f{corrections.accel_offset_2};
 						return;
 					case 3:
-						_thermal_offset = Vector3f{corrections.accel_offset_2};
+						_thermal_offset = Vector3f{corrections.accel_offset_3};
 						return;
 					}
 				}