Re: [w3c/manifest] Remove the default value for start_url (#670)

> But maybe some sites actually don't want their site so show up as a PWA even when using a service worker, so maybe we need a way to opt out of that

Practically speaking, the best signal an app can provide that it doesn't want to be a PWA is `"display: browser"` (which is the default), not omitting the `start_url`.

Any manifest with `"display: browser"` (or missing display) will not be installable in Chrome, and should generally be taken as a signal that it doesn't want to be a PWA.

Any manifest with `"display: standalone"` is sending a signal that it wants to be run in a standalone window (and thus should be installable).

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