[Commits] [wesnoth/wesnoth] dca021: Initialize sdl::UserEvent to all zeroes

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/wesnoth/wesnoth
  Commit: dca021e9ad0a53d5c7424d94fbfb9fdcc3b6b7b9
      https://github.com/wesnoth/wesnoth/commit/dca021e9ad0a53d5c7424d94fbfb9fdcc3b6b7b9
  Author: Jyrki Vesterinen <sandgtx at gmail.com>
  Date:   2017-09-17 (Sun, 17 Sep 2017)

  Changed paths:
    M src/sdl/userevent.hpp

  Log Message:
  -----------
  Initialize sdl::UserEvent to all zeroes

It was the entire point of pull request #1968, after all.
Apparently this bit was lost in the midst of refactoring.

While I'm here, also utilize standard formatting practices,
in particular indenting with tabs.
(My bad that I missed space indentation while reviewing the pull request.)