Remove ServerException wrong logic

Author: mzitnik

client-v2/src/main/java/com/clickhouse/client/api/ServerException.java

@@ -63,12 +63,6 @@ private boolean discoverIsRetryable(int code, String message, int transportProto
             case 425: // SYSTEM_ERROR
             case 999: // KEEPER_EXCEPTION
                 return true;
-            case 0:
-                switch (transportProtocolCode) { // Bad request
-                    case 400: // Bad request
-                    case 500: // Internal server error
-                        return true;
-                };
         };
         return false;
     }