Fixed #11710 - Validation of checkbox data with multiple values

[inietov]

Description

When editing assets with customfields of type checkbox, if the values of the checkboxes are submitted via API they can take the form of an array of this form: [Apple,Pear,Grapes] against the form that the system saves the values: [Apple, Pear, Grapes] (hint, one uses a single comma as delimiter and the other uses a comma and a space). So this PR let both forms when working with this kind of custom fields.

Fixes #11710

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Test Configuration:

• PHP version: 8.1.10
• MySQL version: 8.0.23
• Webserver version: nginx/1.19.8
• OS version: Debian 10

Checklist:

• I have read the Contributing documentation available here: https://snipe-it.readme.io/docs/contributing-overview
• I have formatted this PR according to the project guidelines: https://snipe-it.readme.io/docs/contributing-overview#pull-request-guidelines
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[snipe]

Looks great, thank you!

[mrdanleey]

I have a problem now with my custom Checkbox field and the following values:

BIOS wachtwoord ingesteld
Computernaam ingesteld
Image geïnstalleerd op de laptop
BIOS-update geïnstalleerd

I can check every checkbox and the changes are saved in de database but not returned (no checkmarks) when I edit the asset.
I found this change and tried what is does if I revert it in my installation of Snipe-IT. After the reverse I see the checkmarks. So
this is a bug from a bugfix i guess?

I'm using the newest version of Snipe-IT (6.0.12), PHP 8.1.12, Laravel 8.83.25)
Tried other PHP-versions also.