Filter function did not get parent group index

When filtering a selection/transition, the callback function was not getting the second group index. I am unable to build/test since npmjs is currently down, but it seems pretty apparent this is the fix.


Note that looking for other instances of this with e.g. `grep '\bi)' -R src/selection src/transition` it appears the transition tween functions are also missing this (and more difficultly so, since it looks like their third parameter is already used for something else) and perhaps the data bind (although AFAICT this third parameter may not be appropriate in that context anyway).