Bluetooth: tester: Fix setting nonconn advertising type

BTP API allows to set only advertising and scan response data without
declaring advertising type. Advertising type is deduced from current
flags status. Scan response data is static in tester - to set non
connectable mode in current BTP API scan response length must be
considered.

Change-Id: I742cd8ec774c24f317d639835844a4743bb25445
Signed-off-by: Grzegorz Kolodziejczyk <grzegorz.kolodziejczyk@tieto.com>