Bug 1693879 [wpt PR 27709] - Update wpt metadata, a=testonly

wpt-pr: 27709 wpt-type: metadata
2021-02-20 00:10:00 +00:00 · 2021-02-20 00:10:00 +00:00 · d62b901d21
--- a/testing/web-platform/meta/html/semantics/interactive-elements/the-popup-element/popup-light-dismiss-on-scroll.tentative.html.ini
+++ b/testing/web-platform/meta/html/semantics/interactive-elements/the-popup-element/popup-light-dismiss-on-scroll.tentative.html.ini
@ -0,0 +1,4 @@
 [popup-light-dismiss-on-scroll.tentative.html]
  [Scrolling light-dismisses all popups]
    expected: FAIL