Yagusmart energy meter: make breaker_id optional

Seems to not always be reported.

Discussion #1858

custom_components/tuya_local/devices/yagusmart_3pn_energymeter.yaml

@@ -24,6 +24,7 @@ primary_entity:
     - id: 19
       type: string
       name: breaker_id
+      optional: true
 secondary_entities:
   - entity: sensor
     name: Reverse energy