Odometry twist is erroneously reported in odom frame

[peci1]

According to Odometry message docs, twist should be expressed in the child frame, which is body.

According to Bodsdyn API docs, velocity_of_body_in_odom is expressed in odom frame.

Thus the twist published by the driver is invalid for downstream nodes that expect it to be in body frame.

https://github.com/heuristicus/spot_ros/blob/e71e726ee48328985a6015f634acd531e3935e92/spot_driver/src/spot_driver/ros_helpers.py#L290-L296

Note that fixing this bug could break downstream code that has already adapted to this deviation from the standard, so care has to be taken.