[w3c/manifest] Set the manifest request's `destination`. (#829)

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative requirements
* [ ] Adds new normative recommendations or optional items
* [X] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [ ] Is a "chore" (metadata, formatting, fixing warnings, etc).

Commit message:

Manifest's fetching algorithm currently defines the request's `initiator` as "manifest",
but neglects to set the `destination`. This patch corrects this minor oversight.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/829

-- Commit Summary --

  * Set the manifest request's `destination`.

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/manifest/pull/829.patch
https://github.com/w3c/manifest/pull/829.diff

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