Look for boot id key _id rather than boot_id in bisection data
Look for boot id key _id rather than boot_id in bisection data

Now that the boot entry is used directly in the boot data, the _id
field from the boot entry is available rather than the created boot_id
one.  To be backwards compatible, use boot_id if it's there.
Otherwise, use the _id.

Signed-off-by: Guillaume Tucker <e7e20b7c30f19d4ca6b81319ef81bf200369d137@collabora.com>

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