fix(owon_pc341_energymeter): fix missing scale

Issue #4699

custom_components/tuya_local/devices/owon_pc341_energymeter.yaml

@@ -450,6 +450,7 @@ entities:
         unit: kWh
         class: total_increasing
         mapping:
+          - scale: 100
       - id: 102
         type: base64
         optional: true