PLAYNEXT-750 Fix RTS Podcasts channel icon on CarPlay

[pyby]

Description

New RTS radio channel icons were introduced in #514 .
Missing CarPlay check, the new RTS Podcasts icon is cropped on the external screen "CarPlay".
This PR proposes to fix it.

Also fixing a @svenduvoisin feedback about "RTS Option Musique" channel title, with an unexpected espace.

Changes Made

• Like RSI Podcasts channel, use an icon pdf variant for CarPlay, with margins. The 40pts * 40pts used in RSI is now also use for RTS.
• Fix RTS Option Musique channel title displayed in CarPlay in remote and local config.

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.