Ne pas boucler à la fin de la navigation dans les articles

Corrige https://github.com/marienfressinaud/FreshRSS/issues/407
Alternative à https://github.com/marienfressinaud/FreshRSS/pull/409 qui conserve le fait que l'article se ferme, et plus simple.

p/scripts/main.js

@@ -172,12 +172,14 @@ function mark_favorite(active) {
 }
 
 function toggleContent(new_active, old_active) {
-	old_active.removeClass("active").removeClass("current");
+	old_active.removeClass("active");
 
 	if (new_active.length === 0) {
 		return;
 	}
 
+	old_active.removeClass("current");
+
 	if (does_lazyload) {
 		new_active.find('img[data-original], iframe[data-original]').each(function () {
 			this.setAttribute('src', this.getAttribute('data-original'));