Fix border-radius for bubble-media-player

[MrBearPresident]

Fixes issue #747

[Clooos]

Thank you! This is merged!

[gmalbert]

I'm not seeing this as corrected, and for me, it's actually worse. Now all of the cards (other than section header) are rectangles rather than rounded, and I removed the rgba values completely to avoid this issue. Code is below. I'm not seeing heading titles now either. Same or different issue? I'm on the latest version: 2.3.2.

type: vertical-stack
cards:
  - type: custom:bubble-card
    card_type: pop-up
    hash: "#music"
    button_type: switch
    icon: mdi:music-box-multiple-outline
    name: Music Assistant
    tap_action:
      action: navigate
      navigation_path: /music-assistant
    double_tap_action:
      action: more-info
    hold_action:
      action: more-info
    button_action:
      tap_action:
        action: navigate
        navigation_path: /music-assistant
    show_attribute: false
  - type: custom:bubble-card
    card_type: media-player
    entity: media_player.bedroom
    show_state: false
    name: Bedroom
  - type: custom:bubble-card
    card_type: media-player
    entity: media_player.office_homepod
    show_state: false
    name: Office
  - type: custom:bubble-card
    card_type: media-player
    entity: media_player.basement_homepod
    show_state: false
    name: Basement
  - type: custom:bubble-card
    card_type: media-player
    entity: media_player.movie_room_homepod
    show_state: false
    name: Movie Room

[Clooos]

That's my fault! I'm made a mistake with the @MrBearPresident's PR! I will fix that really soon!