webhook patch image override uses the wrong context

Sorry for the lack of an MR, my account doesn't let me fork 🤦.

The context for the base component of the registry in the admission webhook patch job is set to alertmanager I assume on accident: https://repo1.dso.mil/big-bang/product/packages/monitoring/-/blob/main/chart/templates/prometheus-operator/admission-webhooks/job-patch/job-patchWebhook.yaml#L41

Should be:

          {{- $registry := .Values.global.imageRegistry | default .Values.prometheusOperator.admissionWebhooks.patch.image.registry -}}