Fixes logic that disables prev/next question btns
Fixes logic that disables prev/next question btns

(closes #2211)
Merge branch 'jbau-2211-prev-next-arrow-fix' of https://github.com/Stanford-Online/class2go into jbau-2211-prev-next-arrow-fix
Merge pull request #2212 from Stanford-Online/jbau-2211-prev-next-arrow-fix

Jbau 2211 prev next arrow fix