Fix shell format warning in library.sh

[nak3]

As per title, this patch fixes shell format warning in library.sh.
It was discovered by https://github.com/knative/hack/pull/297/files but didn't fix because it didn't touch all of them.

[knative-prow]

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[nak3]

/cc @kvmware @upodroid

[knative-prow]

@nak3: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
integration-tests_hack_main	c8dfe4f	link	true	/test integration-tests

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[nak3]

Closing as the warning is produced forever and one of the reviewdog's suggestion:

[shellcheck] reported by reviewdog 🐶

Raw Output:
library.sh:286:-        local status=(`echo -n ${pod} | cut -f2 -d' ' | tr '/' ' '`)
library.sh:286:+        local status=($(echo -n "${pod}" | cut -f2 -d' ' | tr '/' ' '))

I changed it as 8354146 then integration test started failing...

[upodroid]

You can configure shellcheck to ignore a specific line.

# shellcheck disable=SC2059 Replace it with the correct id