Tongou QCB2 single phase: make dp 109 optional

Issue #1769

custom_components/tuya_local/devices/tongou_qcb2_singlephasebreaker.yaml

@@ -155,6 +155,7 @@ secondary_entities:
       - id: 109
         type: string
         name: switch
+        optional: true
         mapping:
           - dps_val: online
             value: true