Fixed #9801 #11199 Default Values for Checkbox Field Types Unaccessible

[inietov]

Description

I love when a proper PR fixes a couple or more of issues. When we had an element type of checkbox in a custom field, and we tried to assign default values to that element, the controls doesn't show up properly, so now they are showing and functioning nicely. Also, while fixing this I ended up addressing an issue where when changing an element, textbox for example, with a format of type numeric, if we change it to a radiobutton or a checkbox, they conserve the numeric format and we can't set values alphanumeric to those checkboxes, making 'em not usable.

Fixes #9801 #11199

Type of change

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

How Has This Been Tested?

Test Configuration:

• PHP version: 8.1
• 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]

Excellent work!