Fill sessions with data after adding the column

[Hlavtox]

Questions	Answers
Description?	The script doesn't fill new session columns with data, resulting in an error sometimes. This fills it.
Type?	bug fix
BC breaks?	no
Deprecations?	no
Fixed ticket?	Fixes ##652 (comment)
Sponsor company
How to test?	Upgrade from 1.7.6.9 to 8.1.2, directly after upgrade, open phpmyadmin and check that there won't be an empty date_add and date_upd in ps_employee_session.

[AureRita]

Hi @Hlavtox

Thank you for your PR, I tested it and it seems to works as you can see :

Untitled_.Nov.28.2023.10_52.AM.webm

As you can see at the end, we have two session of the id employee 1, it's one from the previous version and one from the last version, don't know if this issue have to block this PR. If not, It'll be QA ✔️

Thank you

[Hlavtox]

@AureRita That's normal, you can be logged in from multiple browsers/IPs/whatever. Outdated sessions can be cleaned using the button in BO. :-) Thanks!