fix(mastodon): Adjust create job to use correct role

This patch should create the inital Admin with the correct role.

Reference / Cherry-pick from:
https://github.com/mastodon/chart/pull/1/commits/3bf6c8af2d13114d1954d33931bf90886eb6ded2

charts/mastodon/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