Transaction details: scroll to top automatically on display

On mobile the transaction details screen is sometimes scrolled (I guess it keeps the scroll from the previous screen), hiding the "go back to reports list" link.

The user then needs to scroll to the top (he has to know there is a link at the top though), but most of the times that just triggers the "pull to refresh" feature of the browser, thus refreshing the page and still not showing the link.

We should at least force the scroll position to 0 for that page.