fix: 🐛 Fix welcome webview checkboxes

[meisZWFLZ]

Resolves #235

Previously the welcome webview checkboxes wouldn't do anything. This fixes that.

Known edge case

The webview will not reflect changes to settings directly from the settings UI after it has been opened.
This is rare and largely cosmetic, so it should be fine to leave.

[meisZWFLZ]

oh actually the better fix would be to rename the settings in package.json:

In the settings UI, your configuration key will be used to namespace and construct a title. Though an extension can contain multiple categories of settings, each setting of the extension must still have its own unique key. Capital letters in your key are used to indicate word breaks. For example, if your key is gitMagic.blame.dateFormat, the generated title for the setting will look like this:

Blame: Date Format

https://code.visualstudio.com/api/references/contribution-points#Configuration-schema

But idk how'd that would affect user's current configs, so I think I won't do that.

[AndrewLuGit]

works