Fix: favicon must use dol_buildpath and not hardcoded path

htdocs/core/lib/security2.lib.php

@@ -286,7 +286,7 @@ function dol_loginfunction($langs,$conf,$mysoc)
 
 	// Set jquery theme
 	$dol_loginmesg = (! empty($_SESSION["dol_loginmesg"])?$_SESSION["dol_loginmesg"]:'');
-	$favicon=DOL_URL_ROOT.'/theme/'.$conf->theme.'/img/favicon.ico';
+	$favicon=dol_buildpath('/theme/'.$conf->theme.'/img/favicon.ico',1);
 	if (! empty($conf->global->MAIN_FAVICON_URL)) $favicon=$conf->global->MAIN_FAVICON_URL;
 	$jquerytheme = 'smoothness';
 	if (! empty($conf->global->MAIN_USE_JQUERY_THEME)) $jquerytheme = $conf->global->MAIN_USE_JQUERY_THEME;