fix(base): improve the way of redirection in login workflow for predefined default page

[vhr]

Description

the user has to modify the default page to be the React page as Event views and after that to logout and login again this case is not covered in the PR https://github.com/centreon/centreon/pull/8547

Fixes MON-5149

Type of change

• Patch fixing an issue (non-breaking change)
• New functionality (non-breaking change)
• Breaking change (patch or feature) that might cause side effects breaking part of the Software
• Updating documentation (missing information, typo...)

Target serie

• 2.8.x
• 18.10.x
• 19.04.x
• 19.10.x
• 20.04.x (master)

Checklist

• I followed the coding style guidelines provided by Centreon
• I have commented my code, especially new classes, functions or any legacy code modified. (docblock)
• I have commented my code, especially hard-to-understand areas of the PR.
• I have made corresponding changes to the documentation.
• I have rebased my development branch on the base branch (master, maintenance).

[UrBnW]

As proposed in #8354, you may have the same redirection to handle in www/index.php :)