[w3c/manifest] Fix issue introduced in #979 (#980)

`s/icon/icons`

Thanks, @beaufortfrancois!
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/980

-- Commit Summary --

  * Fix issue introduced in https://github.com/w3c/manifest/pull/979

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/manifest/pull/980.patch
https://github.com/w3c/manifest/pull/980.diff

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https://github.com/w3c/manifest/pull/980