Rigid Body transform do not syncronize across multiple users

[sorenhan]

Rigid body simulations work fine with a single user. However, once a second user enters, the objects teleport away.

Repro steps:

1. Instantiate an MRE that uses rigid body physics, for example the functional test named rigid-body-test
2. Have a second user enter the same space.
3. Observe rigid bodies

[sorenhan]

Remember to also test behavior when MRE changes authoritative user.