Fixes rate action

bookwyrm/templates/snippets/rate_action.html

@@ -4,7 +4,9 @@
     {% for i in '12345'|make_list %}
     <form name="rate" action="/rate/" method="POST" onsubmit="return rate_stars(event)">
         {% csrf_token %}
+        <input type="hidden" name="user" value="{{ request.user.id }}">
         <input type="hidden" name="book" value="{{ book.id }}">
+        <input type="hidden" name="privacy" value="public">
         <input type="hidden" name="rating" value="{{ forloop.counter }}">
         <button type="submit" class="icon icon-star-{% if book|rating:user < forloop.counter %}empty{% else %}full{% endif %}">
             <span class="is-sr-only">{{ forloop.counter }} star{{ forloop.counter | pluralize }}</span>