Bug 1463510 [wpt PR 11104] - Update wpt metadata, a=testonly

wpt-pr: 11104
wpt-type: metadata

testing/web-platform/meta/media-source/mediasource-is-type-supported.html.ini

@@ -23,3 +23,4 @@
   [Test invalid MIME format "video/webm;codecs="""]
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1191833
     expected: FAIL
+

testing/web-platform/meta/media-source/mediasource-sequencemode-append-buffer.html.ini

@@ -1,5 +1,5 @@
 [mediasource-sequencemode-append-buffer.html]
   prefs: [media.mediasource.enabled:true]
-
   [Test sequence AppendMode appendBuffer(second media segment, then first media segment)]
     expected: FAIL
+