Fix the command to create the admin user (#19827)

* fix the command to create the admin user

* change Admin to Owner

chart/templates/job-create-admin.yaml

@@ -55,7 +55,7 @@ spec:
             - {{ .Values.mastodon.createAdmin.email }}
             - --confirmed
             - --role
-            - admin
+            - Owner
           envFrom:
             - configMapRef:
                 name: {{ include "mastodon.fullname" . }}-env