Fix zoom on product detail page when there is a large right column

[Michael-Herzog]

If there is much content on the right site of a product detail page and we scroll to the bottom the gallery will be fixed to the top but the zoom container stays where it is.

https://core.smartstore.com/frontend/apple-pro-hipster-bundle/

Probably we have to add an absolute positioned element within the right container which scrolls to the bottom the same way the gallery does.