[Sprite] 453 454 Croagunk Toxicroak (base fix & female vatiants) @ vari

[pom-eranian]

Adjusted base sprites to get rid of floating mouth corner.
Sprites have been saved in indexed format.
Recolored the new base sprites in the Variant colors.
Affected sprites:

• All Toxicroak front sprites

added a gender difference - Rare male and epic female changed colors compared to the previous version.
Affected sprites:

• Male rare sprites,
• female epic sprites

Screenshots/Videos

How to test the changes?

set species to 453 croagunk, 454 toxicroak
set shiny= true
set variant as needed
set gender as needed

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?