Bluetooth: Fix Low energy Proximity path loss threshold alert

Fix sending alert from the proximity client when the
received RSSI of the remote device equals the threshold
set on the client.

CRs-fixed: 344936
Change-Id: I598d7d66b492cb76754280d657b6e6d55dd0903b
Signed-off-by: Archana Ramachandran <archanar@codeaurora.org>