Subreddit Rules: Remove action-form css class

This is binding some extra event handlers to be bound in
action-forms.js that aren't needed on the new form.

r2/r2/public/static/css/reddit.less

@@ -10914,6 +10914,7 @@ body.with-listing-chooser {
     max-width: 300px;
 }
 
+.subreddit-report-form,
 .action-form {
     display: none;
     background-color: #f6e69f;

r2/r2/templates/subredditreportform.html

@@ -23,7 +23,7 @@
 
 <%def name="report_form_base(fullname, rules_page_link)">
     <form id="report-action-form"
-            class="subreddit-report-form action-form rounded">
+            class="subreddit-report-form rounded">
         <input type="hidden"
                 name="thing_id"
                 value="${fullname}">