[lua] Fix Einherjar abjuration drops

[wccbuck]

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• 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?

This PR resolves an issue where abjuration drops in Einherjar armory crates were being replaced by beds (itemIDs 1-9, noble bed, chocobo bedding etc).

Ancillary change: This PR also cleans up some logic for trading glowing lamps.

Steps to test these changes

Temporarily set the chance to 100% in the treasure script, run Einherjar, see an abjuration drop instead of an oak bed.