In match_#.html, allow user to "lock" in a pass for future reviews

[arturojreal]

When reviewing multiple matches by structure/exact/verbatim, it would be helpful to have a button or such that would allow the user to "lock" in their selection, such that when moving on from match_1.html to match_2.html or another, compare50 would "remember" the selected pass for review.

[cmlsharp]

This should be like a couple line change I think. When switching views, we already add a parameter to the URL (for easy linking), so this should just be a matter of adding a line to alter the links in the forward / back buttons as well.