Lefant M213: make clean area and time optional

Issue #1918

custom_components/tuya_local/devices/lefant_m213_vacuum.yaml

@@ -147,6 +147,7 @@ secondary_entities:
       - id: 16
         type: integer
         name: sensor
+        optional: true
         unit: m2
   - entity: sensor
     name: Clean time
@@ -158,3 +159,4 @@ secondary_entities:
         type: integer
         name: sensor
         unit: min
+        optional: true