[seaweedfs] Fix setting size for multi-dc volumes

Signed-off-by: Andrei Kvapil <kvapss@gmail.com>
(cherry picked from commit ffb1b89d2e)

packages/extra/seaweedfs/templates/seaweedfs.yaml

@@ -105,7 +105,7 @@ spec:
             {{- if $zone.size }}
             size: "{{ $zone.size }}"
             {{- else }}
-            size: "{{ $.Values.size }}"
+            size: "{{ $.Values.volume.size }}"
             {{- end }}
             {{- if $zone.storageClass }}
             storageClass: {{ $zone.storageClass }}