Bug 1483519 [wpt PR 12498] - Update wpt metadata, a=testonly

wpt-pr: 12498
wpt-type: metadata

testing/web-platform/meta/html/rendering/non-replaced-elements/the-fieldset-element-0/legend-align.html.ini

@@ -0,0 +1,16 @@
+[legend-align.html]
+  [legend[style="margin: 0 auto"\]]
+    expected: FAIL
+
+  [legend[style="margin: 0 0 0 auto"\]]
+    expected: FAIL
+
+  [div[align=right\] legend]
+    expected: FAIL
+
+  [div[align=center\] legend]
+    expected: FAIL
+
+  [div[style="text-align: center"\][align=center\] legend]
+    expected: FAIL
+