Slides do not stick while traversing the slide deck in reverse

[dcarpenter31]

How to reproduce:

1. Navigate to /dev/slide_deck
2. Left-click through the slides until you reach the slide marked 'Slide 3', where the first "sticky" slide is stuck.
3. Left-click until you reach the slide marked 'Slide 5', where the "sticky" slide is no longer stuck.
4. Right-click to traverse the slide deck backwards. Notice that 'Slide 4' will not have the sticky slide stuck to it any longer.

This behavior is fine if slides are not meant to be stuck going backwards and are just for reference going forwards. However, there is a bit of a UX issue in having the experience going forward through the slide show not match up to the experience going backward.