Fix jobserver run (#14983)

cmd/mattermost/commands/jobserver.go

@@ -42,6 +42,7 @@ func jobserverCmdF(command *cobra.Command, args []string) error {
 	defer a.Shutdown()
 
 	a.Srv().LoadLicense()
+	a.InitServer()
 
 	// Run jobs
 	mlog.Info("Starting Mattermost job server")