When setting up an advertisement the code shall always attempt to use
the handle set by the instance since it may not be equal to the instance
ID.

Fixes: e77f43d5 ("Bluetooth: hci_core: Fix not handling hdev->le_num_of_adv_sets=1")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>