Fixed NPC's dropping integrated weapons on death

[azalahli]

Summary

Bugfixes "Added integrated flag to NPC die() check for weapons"

Purpose of change

Fixes #61832

Describe the solution

Added the integrated flag to the check for the weapon drop, which is apparently handled differently from the rest of the inventory.

Describe alternatives you've considered

There is some confusion over the usage of the NO_UNWIELD and INTEGRATED tags, mostly based on if it is bionic or not?
If bionics.json or integrated.json all harmonized tags it should have a similar effect.

Testing

Spawn an NPC -> Randomize NPC class to Apis -> Kill Apis
Be advised that the bug will only occur if the Apis is armed with the claws. (So ensure that the Apis has no better weapon, and is hostile)
Tested the final killing once, after creating a save which would reliably drop the claws on death

Additional context