tests: Bluetooth: change host/adv/resume scan params

When running with the Softdevice Controller, the controller's scheduling
results in missing all of the advertising packets.

This only happens with this particular configuration (scan & adv params,
multirole device).

Use a smaller scan window & interval to work around that (test IUT is not
controller implementation, rather the host).

Signed-off-by: Jonathan Rico <jonathan.rico@nordicsemi.no>