Pass formats explicitly when rendering .md.erb

Changelog: other
EE: true

ee/app/helpers/vulnerabilities_helper.rb

@@ -46,7 +46,11 @@ module VulnerabilitiesHelper
 
     decorated_vulnerability = vulnerability.present
     summary = _('Investigate vulnerability: %{title}') % { title: decorated_vulnerability.title }
-    description = ApplicationController.render(template: 'vulnerabilities/jira_issue_description.md.erb',
+    description = ApplicationController.render(template: {
+                                               partial: 'vulnerabilities/jira_issue_description',
+                                               formats: :md,
+                                               handlers: :erb
+                                               },
                                                locals: { vulnerability: decorated_vulnerability })
 
     vulnerability.project.jira_integration.new_issue_url_with_predefined_fields(summary, description)