Now that DB class has no end date, remove its usage in showing certs
Now that DB class has no end date, remove its usage in showing certs

fixes #2460
Merge branch 'jbau-cert-display-no-enddate' of https://github.com/Stanford-Online/class2go into jbau-cert-display-no-enddate
Merge pull request #2461 from Stanford-Online/jbau-cert-display-no-enddate

Jbau cert display no enddate -- MASTER