Remove default Privacy selection during group creation

[boonebgorges]

During group creation, you're asked to configure 'Privacy Settings':

By default, the 'Public' radio button is checked.

To encourage more intentional choices around privacy, we will provide no default value at all. When loading this page, no radio button will be checked.

We'll probably want to add some client-side validation, since the default state of this part of the form will not be valid. We'll piggyback on existing browser validation.

At the moment we're only building this new feature for CBOX OpenLab.

[boonebgorges]

I've made the change so that no radio button is checked. I added the required attribute to each radio button, so that browser validation ensures that some value is selected before continuing.

A radio with no default value feels odd to me. The HTML spec recommends against it. From https://html.spec.whatwg.org/multipage/input.html#attr-input-required:

To avoid confusion as to whether a radio button group is required or not, authors are encouraged to specify the attribute on all the radio buttons in a group. Indeed, in general, authors are encouraged to avoid having radio button groups that do not have any initially checked controls in the first place, as this is a state that the user cannot return to, and is therefore generally considered a poor user interface.

I'm unsure what else to suggest in its place.