MULE paths always appearing

[Dovixx]

Issue Description:

The MULE path, which you can see with the diagnostic HUD is always shown despite it not moving.

What did you expect to happen:

For it to not stick around

What happened instead:

It was still there despite the mule having traveled that path

Why is this bad/What are the consequences:

Paths that aren't being currently traveled cause confusion

Steps to reproduce the problem:

1. Get a diagnostic HUD or be a ghost with diagnostic HUD enabled
2. Go to a mule
3. Set a destination (in this case it was noticed when the MULEs were set to brig I am guessing any destination would work)
4. See the path be drawn even if the bot isn't moving.

When did the problem start happening:

Unsure noticed today (2022-10-08)

Extra information:

[S34NW]

This is fixed in https://github.com/ParadiseSS13/Paradise/pull/18984