Fix dé EV charger stop button (#4001)

custom_components/tuya_local/devices/dewall_evcharger.yaml

@@ -64,6 +64,9 @@ entities:
         type: boolean
         optional: true
         name: button
+        mapping:
+          - dps_val: false
+            value: true
   - entity: button
     name: Reset
     icon: "mdi:refresh"