make_dev_ssd.sh: Update grub defaultA and defaultB

Update the defaultA=2 and defaultB=3 grub settings to
remove verification.
In change I930d0f3f1a3f8f54edd1dce7f8259e3c261af9a1 the default
options for grub were changed to be defaultA and defaultB instead
of 'set default=2'. Update the removal to support these new
configuration settings.

BRANCH=none
BUG=b:186240229
TEST=on a reven build run `/usr/share/vboot/bin/make_dev_ssd.sh --remove_rootfs_verification
--force`; reboot and confirm verity is disabled

Change-Id: I70ceed432c29865715c525a6ae13f0e7da8ee0ba
Signed-off-by: Jeffery Miller <jefferymiller@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3445175
Reviewed-by: Nicholas Bishop <nicholasbishop@google.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Nicholas Bishop <nicholasbishop@google.com>
diff --git a/scripts/image_signing/make_dev_ssd.sh b/scripts/image_signing/make_dev_ssd.sh
index 992d89c..d9df52a 100755
--- a/scripts/image_signing/make_dev_ssd.sh
+++ b/scripts/image_signing/make_dev_ssd.sh
@@ -106,8 +106,9 @@
   debug_msg "Removing rootfs verification for legacy boot configuration."
   mount_image_partition "$image" 12 "$mount_point" || return $FLAGS_FALSE
   config_file="$mount_point/efi/boot/grub.cfg"
-  [ ! -f "$config_file" ] ||
-    sudo sed -i 's/^ *set default=2 *$/set default=0/g' "$config_file"
+  [ ! -f "${config_file}" ] ||
+    sudo sed -i -e 's/^ *defaultA=2 *$/defaultA=0/g' \
+                -e 's/^ *defaultB=3 *$/defaultB=1/g' "${config_file}"
   config_file="$mount_point/syslinux/default.cfg"
   [ ! -f "$config_file" ] ||
     sudo sed -i 's/-vusb/-usb/g; s/-vhd/-hd/g' "$config_file"