What are the changes the user will see?

Upon evolving Nincada, users will always see Sheninja as genderless.

Why am I making these changes?

This is my first contribution to Pokerogue, I found an issue that looks fun to look into 😄
I believe enforcing providing correct gender would provide users more accurate experience.
fixes #5038

What are the changes from a developer perspective?

On a private method handleSpecialEvolutions specifically targetted for the nincada's evolution called on evolve method, I added the line to update the gender attribute to be genderless.

Screenshots/Videos

Screenshot:

Video:

How to test the changes?

I update src/overrides.ts to include these fields and start a new game, wait until I get a rare candy to trigger Nincada's evolution.

STARTER_SPECIES_OVERRIDE: Species.NINCADA,
XP_MULTIPLIER_OVERRIDE: 999,
STARTING_LEVEL_OVERRIDE: 20,

Note:

It might be a good idea to update the fusionGender of Shedinja to be genderless. I can also include it in this PR as well, but I'll leave it up to the team to decide 👍🏼

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)?