SupportLeanbackDemo: dont override fragment's object from activity

Activity should only initialize fragment's object when it is first created.
Then the object's lifecycle is controled by fragment.

b/17547817

Change-Id: I169111d2936aadfa9386b288e6922c563b4b5277
1 file changed
tree: af78a141efb8c6896a690f9adffc69e9765f3691
  1. samples/