Update let to use var

Signed-off-by: Andrew Dodd <[email protected]>

modules/luci-base/htdocs/luci-static/resources/ui.js

@@ -384,7 +384,7 @@ const UITextfield = UIElement.extend(/** @lends LuCI.ui.Textfield.prototype */ {
 					'title': _('Reveal/hide password'),
 					'aria-label': _('Reveal/hide password'),
 					'click': function(ev) {
-						var e = this.previousElementSibling;
+						let e = this.previousElementSibling;
 						// DOM manipulation (e.g. by password managers) may have inserted other
 						// elements between the reveal button and the input. This searches for
 						// the first previous sibling that is also an input.