Resized panel is not saved after user logs in again

Steps to reproduce:

1. Change the width of the left or right panel using the slider
2. Log out of XWiki
3. As a guest, you will see the new panel width that the user set in step 1
4. Log back in as XWiki admin

Actual result

The width of changed panel will have default width.

Expected result

The width of the panel remains unchanged from step1