Bluetooth: hci_core: Remove check of BDADDR_ANY in hci_conn_hash_lookup_big_state

The check for destination to be BDADDR_ANY is no longer necessary with
the introduction of BIS_LINK.

Fixes: 23205562 ("Bluetooth: separate CIS_LINK and BIS_LINK link types")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>