fix(annotation-tools): handle radius too small with devicePixelRatio

[PaulHax]

No need to scale SVG circle radius by devicePixelRatio.

Before with devicePixelRatio 1

Before with devicePixelRatio 2

After with devicePixelRatio 1

After with devicePixelRatio 2

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[floryst]

LGTM overall. I think we should reduce the handle size by half since the handles are now much larger than before.

[PaulHax]

No strong opinion on handle size. If reduced, they would get smaller for us devicePixelRatio 1 peeps. Let us keep the 3D handle size the same, and just reduce the visual circle size. That would be like the behavior before for when devicePixelRatio = 2

[floryst]

Thanks for the clarification, I did mean the visual handle size. The pickable handle size can remain the same.

[PaulHax]

Reduced visual handle size to 6 CSS pixels.

[floryst]

LGTM