[Bug][UI/UX] Starter select screen now looks for and displays form-specific abilities

[Wlowscha]

Why am I making these changes?

As documented in this video, the starter select screen does not account for alternate forms having different abilities:

Pokerogue.Mozilla.Firefox.2025-03-01.03-10-08.mp4

What are the changes from a developer perspective?

Explicitly check for the ability of the form, rather than the species, whenever there is more than one form.

Screenshots/Videos

After the changes:

Pokerogue.Mozilla.Firefox.2025-03-01.03-11-29.mp4

How to test the changes?

Load a save with all or many unlocks and look around the starter select screen.

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 tested the changes manually?
• Are all unit tests still passing? (npm run test)
  • Have I created new automated tests (npm run create-test) or updated existing tests related to the PR's changes?
• Have I provided screenshots/videos of the changes (if applicable)?
  • Have I made sure that any UI change works for both UI themes (default and legacy)?