Remove show/hide behaviour from permissions form

In research we found that:
- people didn’t initially realise that the permissions expanded when the
  ‘admin’ option was selected
- not having all the options visible at once makes it hard to know what
  permissions you are (and more importantly aren’t) giving to people

This commit makes it so that:
- the options within the ‘admin’ option are always visible
- a bit of Javascript logic makes it so you can pick ‘caseworker’ and
  ‘manage service’, for example (by deselecting one when you pick the
  other)

app/templates/components/radios.html

@@ -137,7 +137,7 @@
 {% endmacro %}
 
 {% macro conditional_radio_panel(id) %}
-  <div class="js-hidden panel panel-border-wide conditional-radios-panel" id="panel-{{ id }}">
+  <div class="conditional-radios-panel" id="panel-{{ id }}">
     {{ caller() }}
   </div>
 {% endmacro %}