ABILITY_TELEPORT causes lots of "terrain.owner is deprecated" warnings

[stevecotton]

Game and System Information

Current master, 1.15.13+dev 4ee5e41

Describe the bug

Units with {ABILITY_TELEPORT} cause lots of warnings about "terrain.owner" and "unit.side" being deprecated.

To Reproduce

1. Have a Silver Mage on a map with villages
2. Get the game to calculate where they can move to

[stevecotton]

This triggers during the AI turn if the side's recruit list includes silver mages; they don't even need to be on the map.

[knyghtmare]

OH...this explains why I was bombarded by over 12k lines if "Invalid WML found" in WoF S5
WoF-The Three Sisters.gz

wesnoth-20210528-230410-16948.log

[stevecotton]

The reproduction steps are short and quick. I'm disappointed that the issue was closed without checking that the issue was fixed, especially given how quick it was to test.

I think the only other cause is the other formula in ABILITY_TELEPORT, but the reason that I don't just change it and push the one-liner is that fixing an issue should include spending time testing.

[sigurdfdragon]

Can confirm that 04455c0 didn't fix the issue

[newfrenchy83]

@CelticMinstrel has forget owner and side in [target]