Bluetooth: hci_core: Fix hci_conn_hash_lookup_cis

hci_conn_hash_lookup_cis shall always match the requested CIG and CIS
ids even when they are unset as otherwise it result in not being able
to bind/connect different sockets to the same address as that would
result in having multiple sockets mapping to the same hci_conn which
doesn't really work and prevents BAP audio configuration such as
AC 6(i) when CIG and CIS are left unset.

Fixes: c14516fa

 ("Bluetooth: hci_conn: Fix not matching by CIS ID")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>