[w3c/uievents] Add missing params for initCompositionEvent (#302)

This removes `locale` parameter as the corresponding attribute has been removed since cb2e9ff0394742744190335b2496ebe976962f06.

The following tasks have been completed:

 * [x] Confirmed there are no ReSpec/BikeShed errors or warnings.
 * [ ] Modified Web platform tests (link to pull request)

Implementation commitment:

 * [x] WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
 * [x] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [ ] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=1700969) - Gecko still implements `locale`.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/uievents/pull/302

-- Commit Summary --

  * Add missing params for initCompositionEvent

-- File Changes --

    M sections/legacy-event-initializers.txt (13)

-- Patch Links --

https://github.com/w3c/uievents/pull/302.patch
https://github.com/w3c/uievents/pull/302.diff

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