WorldBorder collision logic is off by one for positive directions

[TrollyLoki]

Describe the bug
Crafts are allowed to move one block into the world border when moving in a positive direction (+X/+Z).

To Reproduce
Steps to reproduce the behavior:

1. Set the world border size to 1000 (leaving the center at 0,0).
2. Pilot a craft near the east (+X) edge of the worldborder.
3. Move the craft towards the world border one block east a time.
4. Observe that the eastern most blocks of the craft are allowed to get to X=500 despite being outside the world border.
5. Following the same steps a similar problem occurs at the southern (+Z) edge.

Expected behavior
The craft should stop exactly at the world border, so that no blocks can be positioned outside it. This is the current behavior for the other two directions: west (-X) and north (-Z).

Screenshots
A craft moved as far northeast as currently possible:

Versions (please complete the following information):

• Movecraft: Latest dev build (9f54af9)
• Addons: None
• Java: Temurin 21.0.4
• Minecraft: 1.21.4