CLC-3261: Show audio podcasts in class page - Fix spacing

Currently, theres seems to be no spacing between the webcasts and podcasts, since podcast's h3 no longer inherits 

.cc-page-academics h3:not(:first-of-type) {
margin-top: 20px;
}

since it was put into its own div to respect the podcast feature flag.

https://jira.ets.berkeley.edu/jira/browse/CLC-3261