Add space between icons and labels in nuxeo-saved-search-actions (LTS 2021)

Currently, the icons of the Save and Save As menu items of nuxeo-saved-search-actions have no padding - resulting in their labels being positioned right next to the icons.

A padding or margin should be applied to the iron-icon element styling so that the icon and label have sufficient space between each other. In LTS 2019, the following is used:

iron-icon {
    margin-right: 16px;
}

(see attached picture for reference)