[w3c/gamepad] Fix: Standard Gamepad dpad left / right button indices (#89)

The left and right directional pad buttons were in conflict with the
diagram. Swap them.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/gamepad/pull/89

-- Commit Summary --

  * Fix: Standard Gamepad dpad left / right button indices 

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/gamepad/pull/89.patch
https://github.com/w3c/gamepad/pull/89.diff

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