Sunbeam dual bed warmer: make side B settings optional

Issue #2249

custom_components/tuya_local/devices/sunbeam_dual_bedwarmer.yaml

@@ -65,6 +65,7 @@ secondary_entities:
     dps:
       - id: 8
         type: boolean
+        optional: true
         name: switch
   - entity: binary_sensor
     class: problem
@@ -186,6 +187,7 @@ secondary_entities:
     dps:
       - id: 25
         type: boolean
+        optional: true
         name: switch
   - entity: select
     name: Auto-off A