[w3c/manifest] Fix some text relating to fullscreen display mode (#679)

* Remove qualification on recommendation to show security info. Previously only
  applied to fullscreen display mode; now applies to all.
* display: minimal-ui is based on standalone.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/679

-- Commit Summary --

  * display: minimal-ui is based on standalone.
  * Remove qualification on recommendation to show security info.

-- File Changes --

    M index.html (13)

-- Patch Links --

https://github.com/w3c/manifest/pull/679.patch
https://github.com/w3c/manifest/pull/679.diff

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