Strider drops are not affected by Looting

Summary:
Striders always drop 2-5 string, even when killed with a Looting 3 sword.

Steps to Reproduce:

1. Spawn 10 adult striders
2. Kill them without a Looting sword
3. Notice how much string was dropped
4. Spawn another 10 adult striders
5. Kill them with a Looting 3 sword
6. Notice how much string was dropped
7. Repeat these steps multiple times

Observed Results:
Striders always drop 2-5 string when killed with a Looting 3 sword.

Expected Results:
Striders should drop 2-8 string when killed with a Looting 3 sword.