Bug 1878797 [wpt PR 44408] - Update wpt metadata, a=testonly

wpt-pr: 44408
wpt-type: metadata

testing/web-platform/meta/html/semantics/interactive-elements/the-dialog-element/dialog-close-via-attribute.html.ini

@@ -0,0 +1,6 @@
+[dialog-close-via-attribute.html]
+  [Removing the open attribute from an open modal dialog should run the closing algorithm.]
+    expected: FAIL
+
+  [Removing the open attribute from an open non-modal dialog should fire a close event.]
+    expected: FAIL

testing/web-platform/meta/html/semantics/interactive-elements/the-dialog-element/dialog-showModal.html.ini

@@ -0,0 +1,3 @@
+[dialog-showModal.html]
+  [when opening multiple dialogs, the most recently opened is rendered on top]
+    expected: FAIL