[css-ui-4] Disable native apparence after revert-layer if there's still a value in the author origin

See w3c#7239

Author: frivoal

css-ui-4/Overview.bs

@@ -2210,7 +2210,7 @@ Specifically,
 if all the declarations of the [=Author Origin=]
 pertaining to such a [=widget=] are cascaded
 and a [=cascaded value=] exists--
-and is not ''revert'' or ''revert-layer''--
+after having rolled back any number ''revert'' or ''revert-layer'' values--
 for any <a>property that disables native appearance for widgets</a>,
 then that [=widget=] is rendered as a <a>devolved widget</a>.
 The rendering of a <dfn export lt="devolved|devolved widget">devolved widget</dfn>