firstboot: Hide left menu during first boot as intended

This seems to be a regression from earlier behavior.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: Joseph Nuthalapati <njoseph@riseup.net>
2 jobs for master in 13 minutes and 25 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #334228
run-unit-tests

00:05:57

31.87%
 
  Package
passed #334229
build-debian-package

00:07:27