Download manifest modal styling issues

[lynwilhelm]

1. I discovered the content overlaps, so I think it just needs a min-height added.
   

2. Content has alignment issue due to left-right padding. Warning: the filter, grouping, etc modals share the same padding and will be affected. In other words, maybe padding needs to be added globally to all modals and then removed from .ListPicker-module__container--JJf_E???