[Audio] Replace Forest track with custom BGM by Andr06

[Madmadness65]

What are the changes the user will see?

The Forest biome's music track will be replaced with Andr06's custom track, Rogue's Echoes.

Why am I making these changes?

Custom biome music is desired.

What are the changes from a developer perspective?

Replaced audio file and altered loop point. Localization changes will also be handled in the locale repository.

Screenshots/Videos

forest.mp4

How to test the changes?

Go to the Forest biome.

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)
  • [N/A ] 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)?
  • [N/A] Have I made sure that any UI change works for both UI themes (default and legacy)?

Are there any localization additions or changes? If so:

• Has a locales PR been created on the locales repo?
  • If so, please leave a link to it here: Update English Forest BGM entry pokerogue-locales#58
• Has the translation team been contacted for proofreading/translation?