erp5_notebook: Activate jsmd_viewer by default rather than notebook_viewer

bt5/erp5_notebook/SkinTemplateItem/portal_skins/erp5_notebook/Notebook_view/my_text_content.xml

@@ -139,7 +139,7 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python: [(\'editor\', \'notebook_editor\'), (\'portal_type\', context.getPortalType()), (\'maximize\', \'listbox\' not in field.id)]</string> </value>
+            <value> <string>python: [(\'editor\', \'jsmd_editor\'), (\'portal_type\', context.getPortalType()), (\'maximize\', \'listbox\' not in field.id)]</string> </value>
         </item>
       </dictionary>
     </pickle>