fix(palicy_ecpro4_chlorinegenerator): model matched is EC Pro 20

Issue #3451

custom_components/tuya_local/devices/palicy_ecpro4_chlorinegenerator.yaml

@@ -2,7 +2,7 @@ name: Chlorine generator
 products:
   - id: 4lzloikpfiinsmea
     manufacturer: Palicy
-    model: EC Pro 4
+    model: EC Pro 20
 entities:
   - entity: sensor
     name: Output