fix(grant): remove JS error on Grant page

Closes #41098

Signed-off-by: Magnus Anderssen <magnus@magooweb.com>

core/js/login/grant.js

@@ -3,7 +3,7 @@ document.querySelector('form').addEventListener('submit', function(e) {
 	if (wrapper === null) {
 		return
 	}
-	wrapper.getElementsByClassName('icon-confirm-white').forEach(function(el) {
+	Array.from(wrapper.getElementsByClassName('icon-confirm-white')).forEach(function(el) {
 		el.classList.remove('icon-confirm-white')
 		el.classList.add(OCA.Theming && OCA.Theming.inverted ? 'icon-loading-small' : 'icon-loading-small-dark')
 		el.disabled = true