#802 minor fixes to the Upsell modal. This is a re-roll, previous commit was branched off older branch.

Moving the currency symbol inline with the input field
Adding some margin between the form text and donation control group
Overriding grey background and border from .form-actions
Fixed CSS inclusion.
Merge pull request #425 from JacksonRiver/7.x-4.x-802-upsell-modal-fixes

#802 minor fixes to the Upsell modal. This is a re-roll, previous commit...