Fix don't pop up "Actions" menu when long pressing on a file/folder

after open and close "Use swipe gesture".

The FlingerListView will setLongClickable false when open "Use swipe gesture",
if we close "Use swipe gesture",the longClickable still false and don't
pop up "Actions" menu.

Change-Id: Ifccb655d619fd32bc569eddfa5f05b0ca3002a50