message: fix(protocol-designer): set max width of form field rows
  Closes with this last style tweak
diff: .field_row {
  lost-utility: clearfix;
  min-height: 2.25rem;
  + max-width: 24rem;
  /* Field row is for: (optional checkbox) + label + associated fields
  * All items in field row sum to 15/16, leaving 1/16 gap on the right.
  