fix(filters): migrate properly personal filters (sort)

[adr-mo]

Description

This PR aims to fix an issue that occured during the 21.04.0 upgrade.
Sort parameters were added to custom filters but not in the correct format. (saved as object and not array)

Fixes # (issue)

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

• 19.10.x
• 20.04.x
• 20.10.x
• 21.04.x
• 21.10.x (master)

How this pull request can be tested ?

• Update from 21.04.x (where filters are no longer listed)
• Filters should be listed again

Checklist

• I have 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).