Prevent throwing 404 for deleting branding preferece request when branding preference is not already configured

[pavinduLakshan]

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[UdeshAthukorala]

@pavinduLakshan Shall we update the swagger file as well? Since this is kind of a behaviourl change shall we consider the impact on this change as well?

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/10250644906

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/10250644906
Status: failure