[QUA] Remove proposal check for dropdown and add hook to form

[Igort4]

We discussed that checking the user proposal here doesn't really makes sense. I it would be a better practice to get the user proposal from the hook directly in the form component that uses it as a default value and let the submit validation do it's thing (and per form, we decide when we want to let the user change its value or not).

Originally posted by @brnovasco in #74 (comment)