Fix regression where invalid draft could save

Changes to the structure of the forms meant that the form was getting submitted (they were now submit inputs, rather than just buttons).

Also, the css had gotten lost, and so that's readded so the tooltips look correct.

Issue ots/clients/ardc/hypha-tracker#258: Regression: Can save draft without organization name filled in

@jbickel I'm adding you as a reviewer, but don't worry too much about it if you don't have time. Or feel free to review without doing a whole test cycle.