[w3c/manifest] Clarify off-scope theme color (#879)

Closes #755

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative requirements
* [x] Adds new normative recommendations or optional items
* [x] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [ ] Is a "chore" (metadata, formatting, fixing warnings, etc).

Implementation commitment (delete if not making normative changes):

* [ ] Safari (link to issue)
* [ ] Chrome (link to issue)
* [ ] Firefox (link to issue)
* [ ] Edge (public signal)

Commit message:

Currently, the specification does not define which theme color should be applied to an application context when the user navigates off the scope. This change attempts to clarify the behavior.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/879

-- Commit Summary --

  * Editorial: clarify off-scope theme color

-- File Changes --

    M index.html (16)

-- Patch Links --

https://github.com/w3c/manifest/pull/879.patch
https://github.com/w3c/manifest/pull/879.diff

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