Re: [w3c/manifest] Icon matching algorithm: unrecognised purposes can result in "any" (#728)

I just hit this in Chrome.

Adding a "purpose": "maskable" icon in Chrome results in a [Dev Tools warning](https://cs.chromium.org/chromium/src/content/renderer/manifest/manifest_parser.cc?l=299): _"found icon with invalid purpose. Using default value 'any'."_. The icons are interpreted as normal icons.

These "invalid-purpose" icons need to be ignored, not considered to be "any". @dominickng 

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