workon_helper: grammar fixup

BUG=none
TEST=none

Change-Id: Ibabce39747b41cfb65345af03bdf7f658fa3f581
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/408437
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed