fix start proxy (#5621)

sharding-proxy/sharding-proxy-bootstrap/src/main/java/org/apache/shardingsphere/shardingproxy/Bootstrap.java

@@ -113,8 +113,6 @@ public final class Bootstrap {
         Authentication authentication = new AuthenticationYamlSwapper().swap(yamlAuthenticationConfig);
         logAndInitContext(authentication, properties);
         initMetrics(metricsConfiguration);
-        Map<String, Map<String, YamlDataSourceParameter>> schemaRules = getDataSourceParameterMap(ruleConfigs);
-        startProxy(schemaRules.keySet(), port, schemaRules, getRuleConfigurations(ruleConfigs));
         Map<String, Map<String, YamlDataSourceParameter>> schemaDataSources = getDataSourceParameterMap(ruleConfigs);
         startProxy(schemaDataSources.keySet(), port, schemaDataSources, getRuleConfigurations(ruleConfigs));
     }