fb: handle for our navigation bar recentspreload in the button

Recents screen is since some time wonky. With new hardwarekey rebinding
it showed now only more how wonky it is due that home button does not
cancel the preload always to keep the hwkey button logic alive.
As well a problem is that if you bind recents to whatever other navbar
button the preload takes no effect at all (is only binded from google to
the recent tagged view)

Whatever to solve this let the buttons itself decide dependend on the
action if a preload or cancelpreload is needed an peform the action.

This solves all the weird recent screen behaviours and we will need it for
the new recents screen which is in development as well

It looks a bit weird to aquire the statusbar service here for this but in the
button itself there are not much other alternatives. In theory we could set listeners
like google but instead to all buttons and fetch the action from there to decide but
this gives a problem to get if it was a longpress recents or a normal press recents.

So this way seems to be ok.

Change-Id: I9b3b08356f72840399eaabd0be8b0c3fdf09a4bd