Summary: phpqrcode has some old looking php syntax. Fix it quickly since it's one line.
Test Plan:
Before this patch, went to add a TOTP token, saw the error about the undefined variable.
After this patch, successfully added a TOTP token, and used it.
Reviewers: avivey, epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin
Maniphest Tasks: T9300
Differential Revision: https://secure.phabricator.com/D14019
9692c1f2c2