Re: [w3c/manifest] "Default display mode" section is super confusing (Issue #1024)

Consider this sentence (at the end of [section 7.1](https://www.w3.org/TR/appmanifest/#the-display-mode-media-feature)):

> A user agent MUST reflect the applied display mode of the web application via a CSS media query [MEDIAQ]. 

If the user has overridden the manifest's display value, which way is the media feature supposed to go? Is this phrase deliberately not using the term "default display mode" to express some conceptual difference? If so, I can't what the difference is because both this sentence and the definition of "default display mode" rely on the term "apply".

Relatedly, the definition of apply itself could use some help too: the definition says what it means to apply a manifest (when it "affects the presentation or behavior of a browsing context"), but it doesn't say what it means to apply <em>a member of</em> a manifest, though it gets used that way. Are all members considered to apply if the manifest as a whole applies, or to they only apply if they individually made some difference? Do they count as not applying if they've been overridden by the user?

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