sign_official_build.sh: stop messing with +x

BUG=chromium:1141907
TEST=local

Change-Id: I3079ce655a616236ba973383fa0115bce3800a10
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/5062276
Auto-Submit: George Engelbrecht <engeg@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: George Engelbrecht <engeg@google.com>
Commit-Queue: George Engelbrecht <engeg@google.com>
1 file changed