LADX: Probably fix generation error that palex had

[mrkssr]

What is this fixing or adding?

It's a duplicate of #2776 taking over from @zig-for with permission. It also includes the requested change by @Berserker66.

Change description from the original PR:

This needs further testing. The theory is that putting a STONE_BEAK on a dropped key causes this - but I don't remember how or why a regular STONE_BEAK can get put here instead of a STONE_BEAK3, etc.

Edit: this is almost certainly a foreign player's item that got put as a STONE_BEAK item icon."

How was this tested?

Generated multiple times with the player yamls from this Discord post.
Also changed the shuffle_stone_beaks option so there is an item from another player. Checked spoiler log. Generating worked everytime, also with foreign player item on a stone beak chest location.

If this makes graphical changes, please attach screenshots.

n/a

[Exempt-Medic]

Matches the change of the previous PR. I had a generation that failed before these changes and worked after them

[eudaimonistic]

Approving this as I tested this exact change in the previous PR. This commit completely fixes the previous generation crash in all attempts I made, upwards of 50 super massive async generations north of 2000 and even 3000 varied worlds.