[lua] remove duplicate code for Eldieme Necropolis candles

[Grahf0085]

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• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Removes duplicate code for lighting the candles in Eldieme Necropolis. Code is rafactored into one function that lives in globals.lua and called by each candle NPC. The candles are sued to spawn seven different NMs. If this PR goes through there's a couple issues with the lamps I'd like to address next. Such as no fire animation when the lamp is lit, when checking a lit lamp it tells you it's unlit, etc

Steps to test these changes

Trade a flintstone to the lamps. Should behave the same as it always has. Will tell you the lamp is lit and how many of the seven lamps are left to lite. After lighting all seven a NM will spawn at each lamp.