Extracting POIs

[maro-21]

Previously when extracting a point from a building it was moving with the pointer so I could place it where I want.
Currently I can't move the POI because iD decides where to put it.
So I extracted a point here:

but couldn't see where it is.
And finally I found it far away:

I think it would be better to go back to the previous behavior.

[quincylvania]

Single-step extraction is intentional to facilitate the action on multiselections and on touchscreen devices, see #6674.

However, the point should be placed in the center of the of the area. What you're seeing is definitely a bug. I've noticed a few similar issues since we updated to D3 v6, which changed the implementation for calculating centroids.