Bug 1598501 [wpt PR 20380] - Update interfaces/payment-handler.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/payment-handler.idl (#20380)

Source: https://github.com/tidoust/reffy-reports/blob/fea9670/ed/idl/payment-handler.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/615198653
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wpt-commits: 71a13aee05eda0555b9a37231e0fd572965f6234
wpt-pr: 20380

testing/web-platform/tests/interfaces/payment-handler.idl

@@ -25,7 +25,7 @@ enum PaymentDelegation {
 interface PaymentInstruments {
   Promise<boolean> delete(DOMString instrumentKey);
   Promise<any> get(DOMString instrumentKey);
-  Promise<sequence<DOMString>> keys();
+  Promise<sequence<DOMString>>  keys();
   Promise<boolean> has(DOMString instrumentKey);
   Promise<void> set(DOMString instrumentKey, PaymentInstrument details);
   Promise<void> clear();