[FIX] web_editor: keep <i/> elements after icon edition

Any non `<span/>` element which was transformed into an icon thanks to
the media dialog was transform into a `<span/>` then processed by
summernote. In some cases, this processing breaks the DOM... for no
reason as the DOM should not have been transformed into a `<span/>` in
the first place: `<i/>` elements inside a `<span/>` for example should
stay `<i/>` elements after edition.

closes odoo/odoo#60202

X-original-commit: 4bfcb80e3664ccc74b7ec5e7e10ace6e44ab98d3
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/web_editor/static/src/js/wysiwyg/widgets/media.js

@@ -1191,7 +1191,7 @@ var IconWidget = SearchableMediaWidget.extend({
         var style = this.$media.attr('style') || '';
         var iconFont = this._getFont(this.selectedIcon) || {base: 'fa', font: ''};
         var finalClasses = _.uniq(this.nonIconClasses.concat([iconFont.base, iconFont.font]));
-        if (!this.$media.is('span')) {
+        if (!this.$media.is('span, i')) {
             var $span = $('<span/>');
             $span.data(this.$media.data());
             this.$media = $span;