Set height for sidebar icons

This makes sure they are properly scaled in IE11

Signed-off-by: Julius Härtl <jus@bitgrid.net>

core/css/apps.scss

@@ -235,6 +235,7 @@ kbd {
 				&:first-child img {
 				    margin-right: 11px;
 				    width: 16px;
+				    height: 16px;
 				    margin-left: -30px;
 				}