Navbar: Fixes #4663 - Persistent navbar broken on scroll, Chrome for …

…android. Thanks @mmavko 👍

css/structure/jquery.mobile.navbar.css

@@ -1,6 +1,6 @@
 .ui-navbar { max-width: 100%; }
 .ui-navbar.ui-mini { margin: 0; }
-.ui-navbar ul { list-style:none; margin: 0; padding: 0; position: relative; display: block; border: 0; max-width: 100%; overflow:hidden; }
+.ui-navbar ul { list-style:none; margin: 0; padding: 0; position: relative; display: block; border: 0; max-width: 100%; overflow: visible; }
 .ui-navbar li .ui-btn { display: block; text-align: center; margin: 0 -1px 0 0; border-right-width: 0; }
 .ui-navbar li .ui-btn-icon-right .ui-icon { right: 6px; }