PLAYNEXT-195 RTS radio channels update

[pyby]

Description

RTS radio channels are updated for 2024 back to school time.

Follow radioChannels remote configuration: https://github.com/SRGSSR/playsrg-apple/blob/develop/docs/REMOTE_CONFIGURATION.md

Changes Made

• Renaming channel names (for UI).
• Update but not renaming xc asset resources (to avoid complex remote configurations on old and new apps).
• Switch 4 radio channels to hasDarkStatusBar as the titleColor is dark (from figma #292929).
• Use same colors (color, tileColor) as RSI Podcast for the Podcasts channel.

Checklist

• I have followed the project's style guidelines.
• I have performed a self-review of my own changes.
• I have made corresponding changes to the documentation.
• My changes do not generate new warnings.
• I have tested my changes and I am confident that it works as expected and doesn't introduce any known regressions.
• I have reviewed the contribution guidelines.