scrollTo does not work for initialised value

When an `lt-body` is initialised with a value for `@scrollTo`, the table does not automatically scroll to this position.

Instead `scrollTo` only seems to work if a value is provided after the initial render.

I'm willing to take a look at fixing this, but I'm finding it hard to find the code where the scroll is actually registered for a `scrollTo`, so any pointers are welcome :)