bufferAmount property produces incorrect translateY for .scrollbar-content

[d3-vitalii-baziuk]

Hi, thanks for the lib

Got the issue with bufferAmount. Adding that Input property rows in table are shifted to top instead bottom.

Take a look at screenshot please

It works good without bufferAmount property.

[speige]

If you're able to come up with a permanent fix, please submit a pull request. Thanks!