docs-bug(cdk/listbox): Refused to load the image

[Totati]

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The background-image used for indicating selection does not work. There's an error on the console:

Refused to load the image 'data:image/svg+xml;utf8,' because it violates the following Content Security Policy directive: "img-src 'self' ". Note that '' matches only URLs with network schemes ('http', 'https', 'ws', 'wss'), or URLs whose scheme matches self's scheme. The scheme 'data:' must be added explicitly.

https://user-images.githubusercontent.com/17689719/202701346-e7d7c98d-5d0c-4abb-9088-cbf1f94a0097.mp4

Affected documentation page

https://material.angular.io/cdk/listbox/examples