The in-place editor doesn't behave correctly if the CSRF token is invalidated

Follow these steps to reproduce:

• edit an existing plain wiki page in-place
• restart XWiki
• make some change in the in-place editor
• save & continue from the in-place editor => you get the modal telling you that the CSRF token is invalid => force the save
• then cancel => instead of getting the latest version of the document you get the previous version

Another problem can be seen with these steps:

• edit an existing plain wiki page in-place
• restart XWiki
• make some change in the in-place editor
• save & view from the in-place editor => you get the modal telling you that the CSRF token is invalid => force the save => instead of going to view mode you remain in edit mode; clicking Cancel shows the previous version, not the latest