Editorial: move popover invoker reset later

Per whatwg#11246 (comment), this moves the reset of the popover invoker later in the "hide a popover" algorithm. This does not seem to produce any observable, testable effect, but is more consistent.

Closes whatwg#11246.

Author: mfreed7

source

@@ -87002,8 +87002,6 @@ dictionary <dfn dictionary>DragEventInit</dfn> : <span>MouseEventInit</span> {
    <span>showing auto popover list</span>'s last item is <var>element</var>, otherwise
    false.</p></li>
 
-   <li><p>Set <var>element</var>'s <span>popover invoker</span> to null.</p></li>
-
    <li>
     <p>If <var>fireEvents</var> is true:</p>
 
@@ -87039,6 +87037,8 @@ dictionary <dfn dictionary>DragEventInit</dfn> : <span>MouseEventInit</span> {
    <li><p>Otherwise, <span>remove an element from the top layer immediately</span> given
    <var>element</var>.</p></li>
 
+   <li><p>Set <var>element</var>'s <span>popover invoker</span> to null.</p></li>
+
    <li><p>Set <var>element</var>'s <span>opened in popover mode</span> to null.</p></li>
 
    <li><p>Set <var>element</var>'s <span>popover visibility state</span> to <span