Fix typo in LoginScreenController::FocusLoginShelf

My previous CL (crrev.com/606662) made a few typos in this function.

Bug: 854346
Test: manually
Change-Id: If9f1c94a28e3f88cbff58ae5b1549ed09aa3c2e6
Reviewed-on: https://chromium-review.googlesource.com/c/1336469
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608203}
1 file changed