TR2X bug: Lara's posture changes when teleporting off a boat/skidoo while on a slope

**Regression since:** [0.3](https://github.com/LostArtefacts/TR2X/releases/tag/0.3) (Lara doesn't teleport off a boat/skidoo in 0.2.) ________________________ **Steps to reproduce:** 1. `/play 11` 2. `/tp red` 3. Move the skidoo so it's on a slope facing up 4. `/tp 12`