Correct check popover validity checks in activation behavior

Fixes #8983.

source

@@ -82451,14 +82451,13 @@ dictionary <dfn dictionary>DragEventInit</dfn> : <span>MouseEventInit</span> {
    data-x="popover-hidden-state">hidden</span>, then return.</p></li>
 
    <li><p>If <var>popover</var>'s <span>popover visibility state</span> is <span
-   data-x="popover-showing-state">showing</span> and the result of running <span>check popover
-   validity</span> given <var>popover</var> and true is true, then run the <span>hide popover
-   algorithm</span> given <var>popover</var>, true, true, and false.</p></li>
+   data-x="popover-showing-state">showing</span>, then run the <span>hide popover algorithm</span>
+   given <var>popover</var>, true, true, and false.</p></li>
 
    <li>
     <p>Otherwise, if <var>popover</var>'s <span>popover visibility state</span> is <span
     data-x="popover-hidden-state">hidden</span> and the result of running <span>check popover
-    validity</span> given <var>popover</var> and false is true:</p>
+    validity</span> given <var>popover</var>, false, and false is true:</p>
 
     <ol>
      <li><p>Set <var>popover</var>'s <span>popover invoker</span> to <var>node</var>.</p></li>