reproducible debian: build.sh: fix SQL error

ERROR:  column reference "package_id" is ambiguous
LINE 1: ...led16-arm64.debian.net', job='arm64_4/9231' WHERE package_id...
                                                             ^

Now, I can't see how it can possibly be ambiguous in such query with
only one table involved, but whatever…

Signed-off-by: Mattia Rizzolo <mattia@debian.org>