Renomme /icons/

Corrige https://github.com/marienfressinaud/FreshRSS/issues/234

app/layout/header.phtml

@@ -10,7 +10,7 @@
 
 <div class="header">
 	<div class="item title">
-		<img class="logo" width="32" height="32" src="<?php echo Url::display ('/icons/icon-32.png'); ?>" alt="[logo]" />
+		<img class="logo" width="32" height="32" src="<?php echo Url::display ('/themes/icons/icon-32.png'); ?>" alt="[logo]" />
 		<h1><a href="<?php echo _url ('index', 'index'); ?>"><?php echo Configuration::title (); ?></a></h1>
 	</div>