Fix a component version in SBAT.example.md
Fix a component version in SBAT.example.md

In the bug2 section, the first Debian `.sbat` has a `grub,1`
component. But at this point in the story, `grub,1` has been revoked by
the update in the bug1 section. Updated it to `grub,2` so that it passes
that check.

Signed-off-by: Nicholas Bishop <6c97ad57acdc3ef121d42022bbc5826e3a51ac7c@google.com>

rhinstaller/shim,rhinstaller/shim,rhinstaller/shim