config: Fix warn "unknown config parameter listen-address"

Because we know it, it's one of the configuration flags.

Signed-off-by: Tatiana Nesterenko <[email protected]>

cmd/neofs-rest-gw/config.go

@@ -285,6 +285,7 @@ var knownConfigParams = map[string]struct{}{
 	cfgPrometheusAddress:    {},
 	cfgPprofEnabled:         {},
 	cfgPprofAddress:         {},
+	cmdListenAddress:        {},
 }
 
 func validateConfig(cfg *viper.Viper, logger *zap.Logger) {