Fix publisher labels in HTML mockup

[isensmith]

Tapping on a publisher header in the List screen expands or collapses the list of titles within. However, tapping on the gear icon in the publisher header to access the sort settings should not trigger the expand/collapse function, but it currently does.

[isensmith]

https://github.com/isensmith/comic-cube/tree/master/mockup/index.html (the List page is the index right now)