[BUG] "Use installed GSudo instead of the bundled one" missing in WinGetUI 3.0.2

[nicerloop]

Please confirm these before moving forward

• I have searched for my feature proposal and have not found a work-in-progress/duplicate/resolved/discarded issue.
• This improvement refers to an existing feature. If you want to suggest a new feature, please use this template
• This improvement is not a bug. If you want to report a bug, please use this template

Describe the improvement

I need to use a custom gsudo (https://github.com/nicerloop/ivanti-self-elevate).
In version 2.2.0 I enable "Use installed GSudo instead of the bundled one".
This option is missing in WinGetUI 3.0.2, so I stick to version 2.2.0 for now.

Describe how this improvement could help users.

Users can elevate rights for winget actions with a custom tool tailored to their needs, in the same way it was possible in WinGetUI 2.2.0.

[marticliment]

Note for future @marticliment: Backend has been implemented on #2161, still requires settings entry