Fix http / https check in setup

Summary:
There was a last-minute edit to this to fix a typo before rP089d8327 landed
which accidentally made it impossible to pass the check. :)

Test Plan:
Put install into setup mode, changed protocol to 'http', 'ftp'.

Reviewed By: cadamo
Reviewers: toulouse, codeblock, cadamo
Commenters: toulouse, codeblock
CC: aran, cadamo, toulouse, codeblock
Differential Revision: 434