Bluetooth: Fix using invalid responder address as peripheral

If Static Random address is used as Identity Address and local privacy
is not used, responder address for slave connection was not set to
Identity Address.

Change-Id: I7a057c0fcb8e6d7e043952a092d16e959841f792
Signed-off-by: Szymon Janc <ext.szymon.janc@tieto.com>