Cannot update "preferredBackupWindow" field for Aurora DBClusters after provisioning

[abrag01]

There is an issue where preferredBackupWindow field cannot be updated with new values after provisioning a RDS Aurora Cluster. The issue specifically seems to be due to a typo on line 575 of rds-controller/pkg/resource/db_cluster/custom_update.go, where "Spec. PreferredBackupWindow" is "Spec. PreferredBackupkWindow"

Steps to reproduce

1. Try updating a preferredBackupWindow field for a Aurora Cluster
2. Check CR, see that the field was not update with the desired value

Expected outcome
The field should've been updated in the CR and in AWS

[github-actions]

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