[w3c/manifest] `display-mode` CSS media feature should include `"display_override"` values (#952)

Now that the [`display_override`](https://github.com/WICG/display-override/blob/master/explainer.md) Web App Manifest field is a thing ([in Chromium](https://blog.chromium.org/2021/01/chrome-89-beta-advanced-hardware.html#:~:text=Display%20override%20in%20web%20app%20manifests) at least), the possible values reported by the  [`display-mode`](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/display-mode) CSS media feature should also include the currently active `display_override` value, given it soon may be anything else than `"fullscreen`, `"standalone"`, `"minimal-ui"`, or `"browser"`; namely, for example, [`"tabbed"`](https://github.com/GoogleChrome/web.dev/pull/4679) or [`"window-controls-overlay"`](https://github.com/WICG/window-controls-overlay/blob/master/explainer.md).

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