Draw white background for dark emojis when dark theme is used

[pelya]

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Description

Different implementation of my PR #14933.
Some emoji images are fully black, which makes them invisible in chats and chat reactions when dark display theme is used. This PR adds a while background for these emojis, so they are visible with both light and dark display themes.

Before:

After:

[pelya]

Hey. Did maintainers take a vacation? When do they return? There was much more git activity a month ago.

[cody-signal]

Thanks for the PR, I'll let the design team know about the desire. In the end it's their call. I don't expect we'll take this change though, just to set your expectations.