Web Inspector: DOM tree is missing parts of the DOM tree when remotel…

…y inspecting iOS devices

https://bugs.webkit.org/show_bug.cgi?id=245314
rdar://100203923

Reviewed by Alexey Proskuryakov.

A typo in our compatibility handling for older protocol versions caused us to not actually add all the DOMNodes to our
frontend representation of the DOM tree.

* Source/WebInspectorUI/UserInterface/Models/DOMNode.js:
(WI.DOMNode):

Canonical link: https://commits.webkit.org/254744@main

Source/WebInspectorUI/UserInterface/Models/DOMNode.js

@@ -162,7 +162,7 @@ WI.DOMNode = class DOMNode extends WI.Object
         if (!InspectorBackend.Enum.CSS.LayoutFlag) {
             let layoutFlags = [WI.DOMNode.LayoutFlag.Rendered];
             if (payload.layoutContextType)
-                layoutFlags.append(payload.layoutContextType);
+                layoutFlags.push(payload.layoutContextType);
             this.layoutFlags = layoutFlags;
         } else
             this.layoutFlags = payload.layoutFlags;