Fix issue actions dropdown showing in incident types

The issue actions dropdown was incorrectly showing in
incident types

app/views/shared/issue_type/_details_header.html.haml

@@ -23,7 +23,7 @@
     %a.btn.gl-button.btn-default.float-right.gl-display-block.d-sm-none.gutter-toggle.issuable-gutter-toggle.js-sidebar-toggle{ href: "#" }
       = sprite_icon('chevron-double-lg-left')
 
-  - if Feature.enabled?(:vue_issue_header, @project)
+  - if Feature.enabled?(:vue_issue_header, @project) && display_issuable_type == 'issue'
     .js-issue-header-actions{ data: issue_header_actions_data(@project, @issue, current_user) }
   - else
     .detail-page-header-actions.js-issuable-actions.js-issuable-buttons{ data: { "action": "close-reopen" } }