regression: need float clear on manage page so footer doesn't end up floated,

add default value to features so that features can be created that are default enabled, or modified later to default enabled without requiring a system config to accomplish this.

view/css/mod_manage.css

@@ -51,3 +51,7 @@
 .selected-channel img {
 	border: 2px solid #ff0000;
 }
+
+.channels-end {
+	clear: both;
+}