AX: Missing type in AXIsolatedObject::setProperty.

https://bugs.webkit.org/show_bug.cgi?id=262702
<rdar://problem/116524008>

Reviewed by Tyler Wilcock.

This causes a crash assert in debug builds. Adding the IntRect missing type to the switchOn call.

* Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.cpp:
(WebCore::AXIsolatedObject::setProperty):

Canonical link: https://commits.webkit.org/268924@main

Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.cpp

@@ -412,6 +412,7 @@ void AXIsolatedObject::setProperty(AXPropertyName propertyName, AXPropertyValueV
             [](URL& typedValue) { return typedValue == URL(); },
             [](LayoutRect& typedValue) { return typedValue == LayoutRect(); },
             [](IntPoint& typedValue) { return typedValue == IntPoint(); },
+            [](IntRect& typedValue) { return typedValue == IntRect(); },
             [](std::pair<unsigned, unsigned>& typedValue) {
                 // (0, 1) is the default for an index range.
                 return typedValue == std::pair<unsigned, unsigned>(0, 1);