[w3c/gamepad] gamepad*connected handlers are only needed on Window (Issue #166)

#144 (cc @saschanaz ) added the `ongamepadconnected` and `ongamepaddiscconnected` to `WindowEventHandlers`, but that mixin is also included in  `HTMLBodyElement`, `HTMLFrameSetElement`, `SVGSVGElement` which have no reason to expose these handlers, since the events is never fired to these interfaces.

I guess this should be replaced by a partial on `Window` directly?

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