BHV-725: VideoTransportSlider now watches the enyo event "move"

...instead of the DOM event "mousemove". This allows the scroller to track the mouse position even when the screen is being scaled for lower resolutions, instead of the cursor being consistently off-its-mark.

Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>