CC-4216: Playlist: 'Close' button for fade in/out is out of the border when it's empty

-fixed

airtime_mvc/application/views/scripts/playlist/playlist.phtml

@@ -38,7 +38,7 @@ if (isset($this->obj)) {
     <?php //echo $this->form; ?>
 
     <div id="crossfade_main" class="crossfade-main clearfix" style="display:none;">
-      	<span class="ui-icon ui-icon-closethick"></span>
+      	<span class="ui-icon ui-icon-closethick sp-closethick-center"></span>
 	    <dl id="spl_editor-main" class="inline-list">
             <dt>Fade in (s):</dt>
             <dd><span contenteditable="true" class="spl_text_input spl_main_fade_in">00</span></dd>

airtime_mvc/public/css/playlist_builder.css

@@ -67,6 +67,10 @@
 	margin-top: 7px;
 }
 
+.sp-closethick-center {
+    margin-top: auto !important;
+}
+
 .spl_title {
 	font-size:14px;
 }