Lefant M213: add error code for vacuum switched off.

Encountered in use: Flashing Red 5 in manual (6 beeps 3 times)

Was going to assume others in that group were lower bits starting there, but
we already have low_battery as 512, which does not fit that pattern.

custom_components/tuya_local/devices/lefant_m213_vacuum.yaml

@@ -94,6 +94,8 @@ primary_entity:
           value: low_battery
         - dps_val: 1024
           value: stuck
+        - dps_val: 262144
+          value: switched_off
     - id: 19
       type: string
       name: map_parameter