Bug 1536291 [wpt PR 15874] - PaymentDetailsModifier.supportedMethods should be a DOMString, a=testonly

Automatic update from web-platform-tests
PaymentDetailsModifier.supportedMethods should be a DOMString

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Merge pull request #15874 from danyao/danyao/payment-request

PaymentDetailsModifier.supportedMethods should be a DOMString
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wpt-commits: f391e31524a0622cae86a2f3e3b1984333bd87be, 5cce79aacdd1c2a5dfcca6408687a84aac20b186
wpt-pr: 15874

testing/web-platform/tests/payment-request/PaymentRequestUpdateEvent/updateWith-method-abort-update-manual.https.html

@@ -141,7 +141,7 @@ recursiveData.foo = recursiveData;
 Object.freeze(recursiveData);
 
 const modifierWithRecursiveData = Object.freeze({
-  supportedMethods: validMethodBasicCard,
+  supportedMethods: "basic-card",
   total: validTotal,
   data: recursiveData,
 });