fix(monitor): modify monitor serviceType in StartService()

1.修改monitor服务在service代码中注册的serviceType：
   alerter ===> monitor

pkg/monitor/service/service.go

@@ -45,7 +45,7 @@ import (
 
 func StartService() {
 	opts := &options.Options
-	common_options.ParseOptions(opts, os.Args, "alerter.conf", "alerter")
+	common_options.ParseOptions(opts, os.Args, "monitor.conf", "monitor")
 
 	commonOpts := &opts.CommonOptions
 	common_app.InitAuth(commonOpts, func() {