Duped E2-spawned seats don't keep their vehicleType

[Arna577]

Describe the bug

Title. I needed an airboat with no movement, so I spawned a seat with E2 and integrated it into my design, only to find out that after duping, the camera limitations imposed by the default vehicle type were back.

How to reproduce the bug

1. Spawn a seat with something like:

@name Spawn Seat
const Model = "models/airboat.mdl"
seatSpawn(Model, entity():pos(), ang(0), 1, "phx_seat3")

2. Get in and see the unrestrained camera movement

3. Get out and duplicate the seat

4. Get in and notice the now restrained camera movement