[FIX] web_editor: snippet options were not working if not pure text

Some snippet options uses an image or icon as description instead of
text (like the gradient option in some themes). Those were not working
anymore as the user click was considered on the image/icon instead of
the option itself.

closes odoo/odoo#27807

addons/web_editor/static/src/js/editor/snippets.options.js

@@ -303,8 +303,8 @@ var SnippetOption = Widget.extend({
      * @param {Event} ev
      */
     _onLinkEnter: function (ev) {
-        var $opt = $(ev.target);
-        if (!$opt.hasClass('dropdown-item')) {
+        var $opt = $(ev.target).closest('.dropdown-item');
+        if (!$opt.length) {
             return;
         }
 
@@ -331,8 +331,8 @@ var SnippetOption = Widget.extend({
      * @param {Event} ev
      */
     _onLinkClick: function (ev) {
-        var $opt = $(ev.target);
-        if (!$opt.hasClass('dropdown-item') || !$opt.is(':hasData')) {
+        var $opt = $(ev.target).closest('.dropdown-item');
+        if (!$opt.length || !$opt.is(':hasData')) {
             return;
         }