Cw 939 whitelist known tokens (#2038)

* [skip-ci] init

* don't get price data for potential scam tokens

* updates

* dont fetch fiat price for scam currencies

lib/polygon/cw_polygon.dart

@@ -208,4 +208,9 @@ class CWPolygon extends Polygon {
       throw err;
     }
   }
+  
+  @override
+  List<String> getDefaultTokenContractAddresses() {
+    return DefaultPolygonErc20Tokens().initialPolygonErc20Tokens.map((e) => e.contractAddress).toList();
+  }
 }