[Support] - Push Down 'position' declaration

[Ginger-Panda]

pathforajs/dist/pathfora.js

Line 467 in 0094f38

if (widget.pushDown) {

We had a customer not too long ago inform us that pushDown didn't work when specifying top as the position of a bar layout modal. Upon some testing and digging I've confirmed that when using top we get the console error from line 471 in the method above... and upon checking some of the code, found the function referenced above. It looks like the function is looking for either top-fixed or top-absolute, where our Pathfora docs (http://lytics.github.io/pathforadocs/layouts/bar/#pushdown) reference the top-absolute as simply top. So the check is failing.

I think we need to either or both:
Adjust the function to allow for top
Adjust our documentation to specify top-absolute