feat: Change mall loading area spawn in large building scenario

[LucioFurnari]

Checklist

Required

• I wrote the PR title in conventional commit format.
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Purpose of change

The previous spawn area made no sense, because you didn't appear in the right place, in addition to always appearing surrounded by zombies.
The spawn in the loading zone was incorrect, spawning outside of it or in the arcade, also added a new spawn on the ceiling.

Describe the solution

Change the spawn to an actual loading zone and add a new spawn on the ceiling.

Describe alternatives you've considered

Testing

I tried it multiple times, and it spawns in the correct area.

Additional context

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