[w3c/gamepad] GamepadEvent constructor is missing the type argument (#35)

https://w3c.github.io/gamepad/#gamepadevent-interface
```WebIDL
[Constructor(GamepadEventInit eventInitDict)]
interface GamepadEvent : Event {
    readonly        attribute Gamepad gamepad;
};
```

A type argument needs to precede the dictionary. `[SameObject]` would be nice to, so:
```WebIDL
[Constructor(DOMString type, GamepadEventInit eventInitDict)]
interface GamepadEvent : Event {
    [SameObject] readonly attribute Gamepad gamepad;
};
```

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