Fix for #4691

What are the changes the user will see?

Nightmare was just not working properly before and hitting the pokemon on improper turns and twice a turn. This fixes that.

Why am I making these changes?

big fix

What are the changes from a developer perspective?

Changed battler tag for nightmare from working after the move to the end of the turn.

Screenshots/Videos

Just when asleep
https://github.com/user-attachments/assets/e9038948-d6ec-4c1b-aa61-8cb36a768965

It works properly when pokemon wakes up and is put back to sleep
https://github.com/user-attachments/assets/60ab9bf9-dbe8-4657-8102-05cee8a0cfdf

How to test the changes?

override files, and new nightmare unit test

Checklist

• I'm using beta as my base branch
• There is no overlap with another PR?
• The PR is self-contained and cannot be split into smaller PRs?
• Have I provided a clear explanation of the changes?
• Have I considered writing automated tests for the issue?
• If I have text, did I make it translatable and add a key in the English locale file(s)?
• Have I tested the changes (manually)?
  • Are all unit tests still passing? (npm run test)
• Are the changes visual?
  • Have I provided screenshots/videos of the changes?