[w3c/uievents] set default for optional dictionary (#239)

This is part of https://github.com/heycam/webidl/issues/758

For *normative* changes, the following tasks have been completed:

 * [X] Modified Web platform tests  - IDL changes will be picked up automatically. 

Implementation commitment:

 * [ ] WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
 * [ ] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [X] [Gecko](https://bugs.chromium.org/p/chromium/issues/detail?id=948139) 

The following bug needs to be fixed in Blink first:
https://bugs.chromium.org/p/chromium/issues/detail?id=948139
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/uievents/pull/239

-- Commit Summary --

  * set default for optional dictionary

-- File Changes --

    M sections/event-types.txt (14)

-- Patch Links --

https://github.com/w3c/uievents/pull/239.patch
https://github.com/w3c/uievents/pull/239.diff

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