Bugfix & support devices with touch and mouse/keyboard

Bugfix for animBars function: when hover event handlers are set for non-touch devices on navbar (#swipebox-action) the CSS class 'visible-bars' is removed by onmouseout event handler, resulting in immediate hiding of navbar regardless of hideBarsDelay option.
Deleted line to remove class on onmouseout event to allow hiding (or not) of bars according to hideBarsDelay option.