[w3c/manifest] Add missing shortcut icon in the list (#979)

Adds the missing `"icons"` member to the shortcut member list. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/979

-- Commit Summary --

  * Add missing shortcut icon

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/manifest/pull/979.patch
https://github.com/w3c/manifest/pull/979.diff

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https://github.com/w3c/manifest/pull/979