Orion BLE lock: sync method is base64

Mark it as such (although no decoding will be done without a mask or format
specifier)

custom_components/tuya_local/devices/ble_orion_lock.yaml

@@ -24,7 +24,7 @@ primary_entity:
       persist: false
       optional: true
     - id: 54
-      type: string
+      type: base64
       name: sync_method
       optional: true
 secondary_entities: