Water valve: add legacy_type

As the Johgee water valve was already released a couple of versions ago,
add a legacy type so the renamed more general config continues to work without
reconfiguring in case anyone has already configured it.

custom_components/tuya_local/devices/ble_water_valve.yaml

@@ -1,4 +1,5 @@
 name: Water Timer Valve
+legacy_type: ble_johgee_water_valve
 products:
   - id: c8800fd30884068f
     name: Johgee Water Timer Valve