feat(xo-server/listVmBackups): use backup.listingDebounce setting (#4972)

packages/xo-server/src/xo-mixins/backups-ng/index.js

@@ -934,9 +934,15 @@ export default class BackupNg {
     )()
   }
 
-  @decorateWith(debounceWithKey, 10e3, function keyFn(remoteId) {
-    return [this, remoteId]
-  })
+  @decorateWith(
+    debounceWithKey,
+    function() {
+      return parseDuration(this._backupOptions.listingDebounce)
+    },
+    function keyFn(remoteId) {
+      return [this, remoteId]
+    }
+  )
   async _listVmBackupsOnRemote(remoteId: string) {
     const app = this._app
     const backupsByVm = {}