fix(deletionPolicy): wrong case

[shanduur]

As discussed during SIG Storage COSI meeting on 6/1/2023, this is fix of default value of case sensitive field DeletionPolicy.

[k8s-ci-robot]

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[mukhoakash]

/ok-to-test
/lgtm

[mukhoakash]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mukhoakash, shanduur

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[mukhoakash]

/lgtm