[css-ui] The interactivity property should not be included in the all shorthand

@flackr

The spec does not currently say, but including interactivity in all seems unfortunate:

<style>
  #inert {
    interactivity: inert;
  }
  #child {
    all: initial;
  }
</style>
<div id="inert">
  <span id="child"></span>
</div>

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