Fix 2 different crashes on orientation change when the dialog asking to confirm
removal of a game from the library is being shown:

  - crash #1 is the same as that fixed by the previous commit (inner fragment
classes need to be public static, to allow Android to re-create them at will)

  - crash #2 is being caused by the getSupportFragmentManager().getFragments()
hack, because the remove confirmation dialog is also a fragment!