Fix overlapping UI with new radio buttons

Not sure what about the new radios is causing this, but they no longer
expand the size of the container, causing an overlap.

The fixed height was originally for performance reasons, but removing
it doesn’t seem to cause the page to jump around on load, so I think
it’s OK.

app/assets/stylesheets/components/radio-select.scss

@@ -29,7 +29,6 @@
 
   .js-enabled & {
 
-    height: 60px;
     overflow: visible;
 
     .multiple-choice {