Remove unsued variable from merge request widget

app/views/projects/merge_requests/widget/_heading.html.haml

@@ -8,14 +8,13 @@
           = link_to "##{@pipeline.id}", namespace_project_pipeline_path(@pipeline.project.namespace, @pipeline.project, @pipeline.id), class: 'pipeline'
           = ci_label_for_status(status)
         for
-        - commit = @merge_request.diff_head_commit
         = succeed "." do
           = link_to @pipeline.short_sha, namespace_project_commit_path(@merge_request.source_project.namespace, @merge_request.source_project, @pipeline.sha), class: "monospace"
         %span.ci-coverage
 
 - elsif @merge_request.has_ci?
   - # Compatibility with old CI integrations (ex jenkins) when you request status from CI server via AJAX
-  - # Remove in later versions when services like Jenkins will set CI status via Commit status API
+  - # TODO, remove in later versions when services like Jenkins will set CI status via Commit status API
   .mr-widget-heading
     - %w[success skipped canceled failed running pending].each do |status|
       .ci_widget{class: "ci-#{status}", style: "display:none"}