[w3c/manifest] BREAKING CHANGE: remove `platform` from ManifestImageResource (#913)

Closes #909

This change (choose one):

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

Implementation commitment (delete if not making normative changes):

* [ ] Safari (link to issue)
* [ ] Chrome (link to issue)
* [ ] Firefox (link to issue)
* [ ] Edge (public signal)

Commit message:

As pointed out in #909, the manifest provides other ways to adapt to platform conventions without explicitly stating a platform. Additionally, the property was never implemented by any browser.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/913

-- Commit Summary --

  * BREAKING CHANGE: remove `platform` from ManifestImageResource

-- File Changes --

    M index.html (38)

-- Patch Links --

https://github.com/w3c/manifest/pull/913.patch
https://github.com/w3c/manifest/pull/913.diff

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