Ros1_bridge failed to pass tf_static message when subscribed from rviz

I didn’t say it was a good solution, just a workaround for now. I’m not aware of any systems that will behave badly when /tf_static is periodic, off-hand. Since most migrated from tf1, where there was no /tf_static, it should be ok for now.

Long term we obviously need to improve the bridge so that latching is supported.