[w3c/manifest] [chore] Fix id of Icon masks section. (#725)

This change (choose one):

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

The following tasks have been completed:

* [X] Confirmed there are no new ReSpec errors/warnings.

Commit message:

[chore] Fix id of Icon masks section.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/725

-- Commit Summary --

  * [chore] Fix id of Icon masks section.

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/manifest/pull/725.patch
https://github.com/w3c/manifest/pull/725.diff

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