use the standard delete icon for removing filters

git-svn-id: https://dev.finn.de/svn/cockpit/branches/reporting_merge@1751 7926756e-e54e-46e6-9721-ed318f58905e

app/views/cost_reports/filters/_activate_filter.rhtml

@@ -9,6 +9,6 @@
 
 <td width="<%= element[:width] || 200 %>">
   <input id= "rm_<%= element[:filter_name] %>" name="fields[]" onclick="remove_filter('<%= element[:filter_name] %>');"
-         type="button" value="" class="icon filter_rem"/>
+         type="button" value="" class="icon filter_rem icon-del"/>
   <label><%= element[:label] %></label>
 </td>

assets/stylesheets/reporting.css

@@ -162,7 +162,6 @@
   font-size: 0 !important;
   line-height: 0 !important;
   cursor: pointer;
-  background-image: url(../images/filter_rem.png);
   background-repeat: no-repeat;
   background-color: transparent;
   background-position: 50%;