fix(tongou_towsmr120_rcbo_breaker): follow file naming convention

leagacy_type added to handle exisiting installations.

custom_components/tuya_local/devices/tongou_towsmr1-20_rcbo_breaker.yaml → custom_components/tuya_local/devices/tongou_towsmr120rcbo_breaker.yaml

@@ -1,4 +1,5 @@
 name: Circuit breaker
+legacy_type: tongou_towsmr1-20_rcbo_breaker
 products:
   - id: hktsllupwmoii1it
     manufacturer: Tongou