[MM-16751] golint model (#17896)

app/plugin_api_tests/test_update_user_status_plugin/main.go

@@ -26,7 +26,7 @@ func (p *MyPlugin) OnConfigurationChange() error {
 func (p *MyPlugin) MessageWillBePosted(_ *plugin.Context, _ *model.Post) (*model.Post, string) {
 	uid := p.configuration.BasicUserID
 
-	statuses := []string{model.STATUS_ONLINE, model.STATUS_AWAY, model.STATUS_DND, model.STATUS_OFFLINE}
+	statuses := []string{model.StatusOnline, model.StatusAway, model.StatusDnd, model.StatusOffline}
 
 	for _, s := range statuses {
 		status, err := p.API.UpdateUserStatus(uid, s)