Fix typos in updater4.sh under firmware/pack_dist

BUG=none
TEST=Ran cros_workon_make chromeos-firmware-zako --test

Change-Id: If237c39c61f880f987e65e4518ea3a3a001a9273
Reviewed-on: https://chromium-review.googlesource.com/256520
Reviewed-by: Patrick Georgi <[email protected]>
Tested-by: Colin Rice <[email protected]>
Commit-Queue: Colin Rice <[email protected]>
1 file changed