LibWeb: dispatch wheel event

[kalenikaliaksandr]

hey everyone, it's my first contribution in serenity. I was tinkering with ladybird for a bit and found out that www.openstreetmap.org is not really usable at the moment because zooming and dragging don't work. Wanna try to fix that and dispatch wheel event seems like a good first step in that direction.

[BuggieBot]

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