CSS - allow multiple widgets in widget field

[bpostlethwaite]

Adding this commit cfd7acb broke they styling of Multiple Values

[bpostlethwaite]

Needed for an application that adds multiple items (looks like this:
)

[aulneau]

@bpostlethwaite Do you think it makes sense to add that remove functionality you have for the group by fields inside of the editor? I like this display and interactivity of adding multiple fields, it reminds me of adding stops on the uber app.

Do we also want 'Multiple Values' to the select grouping columns section?

[bpostlethwaite]

Change it up as you want. We just need to be able to add and remove fields.

I prefer individual rows of groups rather than a single dropdown that can contain multiple values. IMO we want to look fairly standard when built into a native desktop app and not look so web 3.0 as to stick out. But it can and should look great.

[aulneau]

fixed via #195