door: fix checking for Lara position

[rr-]

Checklist

• I have read the coding conventions
• I have added a changelog entry about what my pull request accomplishes, or it is an internal change

Description

Resolves #1419.

Removes the proximity test and instead checks if Lara is on the same tile where the ghost block will spawn.

[walkawayy]

This LGTM from what I tested, but I'm certainly no expert tester.

[lahm86]

This looks good to me. There is another issue though (and it's present in the current release too). If you save and load behind a door (in this non-portal scenario), Lara will void. The problem I believe is that Door_Initialise is called on level load and so Lara's position at that point is at the start of the level. The savegame logic will move her to the door's block, but then there are no further checks for door status. Should we tackle this separately?

[rr-]

I have resolved the savegame issue mentioned above.
However, I've also observed that the camera still shakes when swimming up against the current in the Midas pool when the gate isn't fully closed. It's because we don't place the invisible block during the door animation that prevents Lara from reaching the trigger. It works as expected after the gate fully shuts, though, which is what this PR corrects (along with the save/load issue). I think this is consistent with the OG; can someone verify this?

[lahm86]

Yes, just tried TombATI and you get the same behaviour in that scenario.