Remove the unsetting of background image on mobile.

[aaronjorbin]

Trac ticket: https://core.trac.wordpress.org/ticket/59289

On mobile, the background image is currently removed which causes dark text on a dark background. This was added in the design for 6.3.

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[sabernhardt]

I suggest replacing the current var(--background) with #EAE9E7, the light background color seen in the top right corner. That also could prevent problems if/when the image does not load.

The text overlap would be very common on screens below 600px, though it can overlap at others too. In right-to-left languages, the heading might always appear in front of the numbers.

Additionally, the 6.4 part of the image gets cut off at certain screen sizes.

the edge of the 4 is cut off at 968px:

text overlaps at 900px:

text would overlap at 414px if the background image is restored:

RTL text overlaps at 1200px:

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[aaronjorbin]

Forgot to close this months ago, sorry