[w3c/payment-handler] Add missing space after Promise<T> types (#345)

Spotted in https://github.com/web-platform-tests/wpt/pull/19241.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/345

-- Commit Summary --

  * Add missing space after Promise<T> types

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/345.patch
https://github.com/w3c/payment-handler/pull/345.diff

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