fixed prevent default interaction in mobile mode for drag interaction

[7eXx]

There was a console error when interact with charts in mobile mode.
Console error: Unable to preventDefault inside passive event listener due to target being treated as passive.

[palantirtech]

Thanks for your interest in palantir/plottable, @7eXx! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.