No pipeline in GitLab for MR Comment

## New GitLab pipeline doesn't appear for GitLab Merge Request comment

### Context
- **Gitlab plugin version**: 1.5.11
- **Gitlab version**: 11.6.5
- **Jenkins version**: 2.150.2
- **Job type**: Pipeline

### Logs & Traces
### Problem description
Configuration:

- On Jenkins side "Comment (regex) for triggering a build" is set to "Jenkins please retry a build"
- On GitLab side, for webhook, "Comments" is marked
- Jenkins Pipeline updates GitLab using `updateGitlabCommitStatus`

Steps to reproduce the issue:

- In GitLab on MR page, add the comment "Jenkins please retry a build"
- Jenkins build is performed for MR
- What is expected: a new pipeline will appear on GitLab for MR
- Actual: It looks like GitLab know nothing about the Pipeline run started on Jenkins for the comment

If I commit a change to branch, a new pipeline will appear on GitLab, but for comment on MR page, it is not so.