fix defaults for serviceAccountName for each statefulset to follow exact from helm docs

helm docs: https://helm.sh/docs/chart_template_guide/functions_and_pipelines/#using-the-default-function

k8s/charts/seaweedfs/templates/filer-statefulset.yaml

@@ -52,7 +52,7 @@ spec:
       {{- end }}
       {{- include "seaweedfs.imagePullSecrets" . | nindent 6 }}
       {{- if .Values.global.createClusterRole }}
-      serviceAccountName: {{ default .Values.global.serviceAccountName .Values.filer.serviceAccountName }} # for deleting statefulset pods after migration
+      serviceAccountName: {{ .Values.filer.serviceAccountName | default .Values.global.serviceAccountName | quote }} # for deleting statefulset pods after migration
       {{- end }}
       terminationGracePeriodSeconds: 60
       {{- if .Values.filer.priorityClassName }}

k8s/charts/seaweedfs/templates/master-statefulset.yaml

@@ -56,7 +56,7 @@ spec:
       {{- end }}
       enableServiceLinks: false
       {{- if .Values.global.createClusterRole }}
-      serviceAccountName: {{ default .Values.global.serviceAccountName .Values.master.serviceAccountName }} # for deleting statefulset pods after migration
+      serviceAccountName: {{ .Values.master.serviceAccountName | default .Values.global.serviceAccountName | quote }} # for deleting statefulset pods after migration
       {{- end }}
       {{- if .Values.master.initContainers }}
       initContainers:

k8s/charts/seaweedfs/templates/volume-statefulset.yaml

@@ -50,7 +50,7 @@ spec:
       {{- end }}
       enableServiceLinks: false
       {{- if .Values.global.createClusterRole }}
-      serviceAccountName: {{ default .Values.global.serviceAccountName .Values.volume.serviceAccountName }} # for deleting statefulset pods after migration
+      serviceAccountName: {{ .Values.volume.serviceAccountName | default .Values.global.serviceAccountName | quote }} # for deleting statefulset pods after migration
       {{- end }}
       {{- $initContainers_exists := include "volume.initContainers_exists" . -}}
       {{- if $initContainers_exists }}