[FIX] web_editor: can't use mako/jija if remove space to prettify html

Addapt html method to prettify the html code and keep mako structures.

opw-668409

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

@@ -38,6 +38,7 @@ var FieldTextHtmlSimple = widget.extend({
                 ['insert', ['link', 'picture']],
                 ['history', ['undo', 'redo']]
             ],
+            'prettifyHtml': false,
             'styleWithSpan': false,
             'inlinemedia': ['p'],
             'lang': "odoo",