GF-53497: Update feedback when in preview mode

Previously we assume that pressing FF button is unable when video is in preview mode because control box is not displayed in preview mode.
However, when user use 2 remote controllers at the same time, it is able.
Due to FF key in remocon, user can input fast forward in preview mode.

So, when video player is in preview mode, it should response to user's input.

Enyo-DCO-1.1-Signed-off-by: David Um david.um@lge.com