R1:982e0d78ae10

Fix Cards list in External Accounts

Summary: Minor, sets the list to flush to invoke the correct CSS for the ObjectBox.

Test Plan: Reload Page

Reviewers: epriestley, btrahan

Reviewed By: btrahan

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7909