Media Player does not reset album cover color

[balloob]

Checklist

• [ ] I have updated to the latest available Home Assistant version.
• [ ] I have cleared the cache of my browser.
• [ ] I have tried a different browser to see if it is related to my browser.

The problem

If media player goes from playing to paused, and paused doesn't have an album cover, we still show a square for the album cover.

Sonos playing my Spotify:

State: playing

Attributes:

source_list: This Is Creedence Clearwater Revival
volume_level: 0.36
is_volume_muted: false
media_content_id: x-sonos-vli:RINCON_347E5C35DA6C01400:2,spotify:997fb54731b631d951d3cc968f9e8407
media_content_type: music
media_duration: 256
media_position: 179
media_position_updated_at: 2020-03-11T20:00:28.035860+00:00
media_title: O.N.S. Verhaal
media_artist: Rob Dekay
media_album_name: Alles Gaat Voorbij
shuffle: false
sonos_group: media_player.bookshelf
friendly_name: Bookshelf
entity_picture: /api/media_player_proxy/media_player.bookshelf?token=59588bb569c3a4b7aaab2c7a446db8c10d806a3c16583a4d973acaa185c188ae&cache=e6d9c51a4ee49d47
supported_features: 64063

In Spotify on my Mac, select Spotify to play on my mac. After:

State: paused

Attributes:

source_list: This Is Creedence Clearwater Revival
volume_level: 0.36
is_volume_muted: false
media_content_id: x-sonos-vli:RINCON_347E5C35DA6C01400:2,spotify:2a5ab363818186b463068de2d7ac964c
media_content_type: music
media_position_updated_at: 2020-03-11T19:58:56.394009+00:00
media_title: 
media_artist: 
media_album_name: 
shuffle: false
sonos_group: media_player.bookshelf
friendly_name: Bookshelf
supported_features: 64063

Expected behavior

Steps to reproduce

Environment

• Home Assistant release with the issue:
• Last working Home Assistant release (if known):
• Browser and browser version:
• Operating system:

Problem-relevant configuration

Javascript errors shown in your browser console/inspector

Additional information

[balloob]

This is a bug in Sonos.