[w3c/permissions] Screen sharing permission "display" should be "display-capture" (#199)

Screen sharing typo. It's actually defined as `"display"` in https://w3c.github.io/permissions/#screen-capture but `"display-capture"` in https://w3c.github.io/mediacapture-screen-share/#dfn-getdisplaymedia in step 8.3: *"Prompt the user to choose a display device, with a PermissionDescriptor named `"display-capture"`"*.

`"display-capture"` is also the name of the [feature policy](https://w3c.github.io/mediacapture-screen-share/#feature-policy-integration-0), so we should be consistent and use that.

The history here is `"display"` was the original suggestion. Then we got feedback that this could be misunderstood to mean control over displays, rather than access to their capture. Then I forgot to update all the places. Apologies. Hopefully it's not too late to fix this.



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