Use class property instead of separate th and td class properties

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

@@ -144,57 +144,50 @@ export default {
         {
           key: 'detected',
           label: s__('Vulnerability|Detected'),
-          thClass: 'detected',
-          tdClass: 'detected',
+          class: 'detected',
           sortable: this.isSortable,
         },
         {
           key: 'state',
           label: s__('Vulnerability|Status'),
-          thClass: 'status',
-          tdClass: 'status',
+          class: 'status',
           sortable: this.isSortable,
         },
         {
           key: 'severity',
           label: s__('Vulnerability|Severity'),
-          thClass: 'severity',
-          tdClass: 'severity',
+          class: 'severity',
           sortable: this.isSortable,
         },
         {
           key: 'title',
           label: __('Description'),
-          thClass: 'description',
-          tdClass: 'description gl-word-break-all',
+          class: 'description gl-word-break-all',
           sortable: this.isSortable,
         },
         {
           key: 'identifier',
           label: s__('Vulnerability|Identifier'),
-          thClass: 'identifier',
-          tdClass: 'identifier gl-word-break-all',
+          class: 'identifier gl-word-break-all',
         },
         {
           key: 'reportType',
           label: s__('Reports|Scanner'),
-          thClass: 'scanner',
-          tdClass: 'scanner',
+          class: 'scanner',
           sortable: this.isSortable,
         },
         {
           key: 'activity',
           label: s__('Vulnerability|Activity'),
-          thClass: 'gl-text-right activity',
-          tdClass: 'activity',
+          thClass: 'gl-text-right',
+          class: 'activity',
         },
       ];
 
       if (this.shouldShowSelection) {
         baseFields.unshift({
           key: 'checkbox',
-          thClass: 'checkbox',
-          tdClass: 'checkbox',
+          class: 'checkbox',
         });
       }