[FIX] web_editor: update value at inline html save

In the base summernote library, each event modifying the editable area
DOM trigger an 'onChange' event which update the textarea associated
with the editor.

Some widget (ImageDialog) have been entirely rewritten for Odoo without
copying this behaviour. Hence for those components, if they were the
last to be used and only in the instance of inline backend editor
(FieldTextHtmlSimple widget), before saving updating the widget value by
the current editor value is required.

closes #9784
opw-654240

addons/web_editor/static/src/js/backend.js

@@ -122,8 +122,8 @@ var FieldTextHtmlSimple = widget.extend({
         if (this.options['style-inline']) {
             transcoder.class_to_style(this.$content);
             transcoder.font_to_img(this.$content);
-            this.internal_set_value(this.$content.html());
         }
+        this.internal_set_value(this.$content.html());
     },
     destroy_content: function () {
         $(".oe-view-manager-content").off("scroll");