SalvageMobRestrictions: no warning/logging for safe mobs (e.g. Clugg)

[whatston3]

About the PR

When a mob leaves its restricted grid, if the mob will not be destroyed when leaving (i.e. it's a safe mob that spawns in with a bluespace event), it will not be warned or leave an admin log if leaving the grid.

Why / Balance

Oversight in #2449.

How to test

1. Run addgamerule BluespaceCave.
2. Become Clugg.
3. Leave the grid. You shouldn't get a popup.
4. Return to the grid.
5. Spawn in and become a Xeno queen.
6. Leave the grid. You should get a popup and turn pacified.
7. Return to the grid. No more pacifism.
8. Check the admin logs, you should have nothing from Clugg, and messages about the xeno queen leaving.

Media

Step 6: the xeno queen leaves the grid it's attached to, and is prompted to return.

Requirements

• I have read and am following the Pull Request and Changelog Guidelines.
• I have added media to this PR or it does not require an ingame showcase.

Breaking changes

Changelog

🆑

• fix: Clugg is no longer prompted to return to the cave if leaving.

[whatston3]

Oops. Hold on.
Edit: fixed.

[whatston3]

Merging this as a hotfix - seemed fine in local testing.