Update agent vulnerability report

- move non-reactive variable to $options

ee/app/assets/javascripts/security_dashboard/components/agent/agent_vulnerability_report.vue

@@ -33,9 +33,6 @@ export default {
     };
   },
   computed: {
-    fieldsToShow() {
-      return FIELD_PRESETS[REPORT_TAB.OPERATIONAL];
-    },
     filtersToShow() {
       return FILTER_PRESETS[REPORT_TAB.OPERATIONAL];
     },
@@ -46,6 +43,7 @@ export default {
       this.graphqlFilters.reportType = REPORT_TYPE_PRESETS.OPERATIONAL;
     },
   },
+  fieldsToShow: FIELD_PRESETS[REPORT_TAB.OPERATIONAL],
   REPORT_TAB,
   projectVulnerabilitiesQuery,
 };
@@ -61,7 +59,7 @@ export default {
 
     <vulnerability-list-graphql
       :query="$options.projectVulnerabilitiesQuery"
-      :fields="fieldsToShow"
+      :fields="$options.fieldsToShow"
       :filters="graphqlFilters"
     />
   </div>