Fix invalid HTML output

plugins/acl/acl.php

@@ -453,7 +453,7 @@ class acl extends rcube_plugin
                     case 1: $class = 'partial'; break;
                     default: $class = 'disabled'; break;
                 }
-                $table->add('acl' . $key . ' ' . $class, '<span/>');
+                $table->add('acl' . $key . ' ' . $class, '<span></span>');
             }
 
             $js_table[$userid] = implode($userrights);

plugins/acl/skins/elastic/templates/table.html

@@ -33,5 +33,5 @@
 	<div class="row form-group">
 		<label class="col-sm-4 col-form-label"><roundcube:label name="acl.myrights" /></label>
 		<roundcube:object name="aclrights" class="proplist col-sm-8" />
-	</fieldset>
+	</div>
 </div>