templates/image-builder: fix typo in image-builder sql statement

[schuellerf]

fixes typo in image-builder sql statement…
Just came across the error in the logs

cursor.execute(statement, parameters)
sqlalchemy.exc.ProgrammingError: (psycopg2.errors.SyntaxError) syntax error at or near "b"
LINE 5: b.metadata->>'is_on_prem' as is_on_prem
^
[SQL: select
v.blueprint_id::text as blueprint_id, v.version, b.deleted,
b.metadata->>'exported_at' as exported_at,
b.metadata->>'parent_id' as parent_id
b.metadata->>'is_on_prem' as is_on_prem
from
blueprint_versions v
left outer join blueprints b ON v.blueprint_id = b.id]
(Background on this error at: https://sqlalche.me/e/20/f405)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

[croissanne]

/retest

[schuellerf]

/retest