Diff view: Clicking offset in comparison results list should jump both files to offset

[jms72]

Currently, when comparing two binary files, the files are nicely shown side-by-side with the differences highlighted, and the list of comparison results on the right shows the relevant offsets. However, when clicking an element in that list, only one of the two files jump to the relevant offset, and the other file needs to be manually scrolled to it to actually compare.

Both files should be scrolled to the relevant offset together.