R1:a79e4b786ea3

Restrict hover styles in action list to only href

Summary: We're currently applying these styles to labels, restrict them to only list elements that have an href.

Test Plan: Test a label, an anchor, and a button as an action item.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17031