[Misc/Sprite] Clean up extra Drifblim-related files

[chaosgrimmon]

What are the changes?

Deletes files that the game doeesn't use and the user shouldn't ever receive.

Why am I doing these changes?

The files don't do anything anymore. I told the game to stop using them in #1788 and though I wasn't sure back then if removing them would cause issues, I no longer have those compunctions.

What did change?

Removes files that the game does not use.

Screenshots/Videos

Does not affect the user experience.

After

How to test the changes?

Overrides could be used to ensure epic Drifblim's back animation continues to be an epic Drifblim and not a Drifloon with the wrong animation file.

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?
• 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?~~