Reset last snapshot in NetworkTransformUnreliable

[Vindicatory]

When authority is changed, lastSnapshot will continue to hold an outdated value
This can cause change detection to incorrectly omit a position component after authority changes

e.g. my case:

1. Client A has authority over object and moves it to Y=2
2. The object is released and falls to Y=0 under another authority
3. The object is picked up by Client A again and moved back to Y=2
4. Since lastSnapshot still contains Y=2, PosY is not marked as changed
5. Other clients won't obtain correct Y value

[MrGadget1024]

Try NetworkTransformHybrid, the successor to NTUnreliable