renamed list-group to list-content for consistency with the others

ui/src/css/list.css

@@ -15,7 +15,7 @@
         display: none;
     }
 
-    .list-group {
+    .list-content {
         display: block;
         width: 100%;
         max-height: 425px;

ui/src/settings/backups/backupsList.js

@@ -117,7 +117,7 @@ export function backupsList(propsArg = {}) {
             },
         },
         t.div(
-            { className: "list-group" },
+            { className: "list-content" },
             t.div(
                 {
                     hidden: () => !data.isLoading || data.backups.length,