Change Reportlet classes because of chnages in Collection

Author: Timm Ortloff

public/css/module.less

@@ -214,13 +214,13 @@ form.icinga-form {
 
 /* Form fallback styles end */
 
-.reportlet {
+.collection {
   legend {
     width: 100%;
     border-bottom: 1px solid @gray-lighter;
   }
 
-  .reportlet-container {
+  .form-element-collection {
     border-bottom: 1px solid @gray-lighter;
 
     .btn-remove-reportlet {