fixed #9097: Minor rendering problem within Safari at admin/mail_options and roles permissions

git-svn-id: http://redmine.rubyforge.org/svn/trunk@308 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/roles/_form.rhtml

@@ -11,7 +11,8 @@
   <div style="width:170px;float:left;"><%= check_box_tag "permission_ids[]", p.id, (@role.permissions.include? p) %>
   <%= l(p.description.to_sym) %>
   </div>
-<% end %>
+<% end %>
+<div class="clear"></div>
 </fieldset>
 <% end %>
 <br />