Bluetooth: Fix updating wrong instance's scan_rsp data

The __hci_req_update_scan_rsp_data gets the instance to be updated
which should get passed to update_inst_scan_rsp_data() instead of
always enabling the current instance.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>