Bug 1597661 [wpt PR 20317] - Update interfaces/web-nfc.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/web-nfc.idl (#20317)

Source: https://github.com/tidoust/reffy-reports/blob/5967ec4/ed/idl/web-nfc.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/613990189
--

wpt-commits: 3bf38e8c6ccbbf7624a9cc49996774b994eae9b1
wpt-pr: 20317

testing/web-platform/tests/interfaces/web-nfc.idl

@@ -19,7 +19,7 @@ interface NDEFRecord {
 
   readonly attribute USVString recordType;
   readonly attribute USVString? mediaType;
-  readonly attribute USVString id;
+  readonly attribute USVString? id;
   readonly attribute DataView? data;
 
   readonly attribute USVString? encoding;