Fix zero count of vulnerability severity count

- in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/58522,
  `this.scope` was switched out for `this.dashboardType`,
  but there was missed instance

ee/app/assets/javascripts/security_dashboard/components/vulnerability_count_list.vue

@@ -51,7 +51,7 @@ export default {
         };
       },
       update(data) {
-        return data[this.scope]?.vulnerabilitySeveritiesCount || {};
+        return data[this.dashboardType]?.vulnerabilitySeveritiesCount || {};
       },
       result() {
         this.queryError = false;

ee/changelogs/unreleased/328254-fix-zero-severity-count.yml

+---
+title: Fix zero count of vulnerability severity count
+merge_request: 59680
+author:
+type: fixed