Use CSS to hide reply forms

We were using inline styles and passing local variables around, while
the rule we were following is very simple: it's only hidden if it's a
form to reply to a comment.

app/views/comments/_comment.html.erb

@@ -107,7 +107,6 @@
             <% if !valuation || can?(:comment_valuation, comment.commentable) %>
               <%= render "comments/form", { commentable: comment.commentable,
                                            parent_id: comment.id,
-                                           toggeable: true,
                                            valuation: valuation } %>
             <% end %>
           <% end %>

app/views/comments/_comment_tree.html.erb

@@ -27,7 +27,6 @@
           <% elsif !valuation || can?(:comment_valuation, commentable) %>
             <%= render "comments/form", { commentable: commentable,
                                           parent_id: nil,
-                                          toggeable: false,
                                           valuation: valuation } %>
           <% end %>
         <% else %>

app/views/comments/_form.html.erb

@@ -1,7 +1,7 @@
 <% valuation = local_assigns.fetch(:valuation, false) %>
 <% cache [locale_and_user_status, parent_id, commentable_cache_key(commentable), valuation] do %>
   <% css_id = parent_or_commentable_dom_id(parent_id, commentable) %>
-  <div id="js-comment-form-<%= css_id %>" <%= raw("style='display:none'") if toggeable %> class="comment-form">
+  <div id="js-comment-form-<%= css_id %>" class="comment-form">
     <%= form_for Comment.new, remote: true, html: { id: "new_comment_#{css_id}" } do |f| %>
       <%= f.text_area :body,
         id: "comment-body-#{css_id}",