Bluetooth: Host: add missing zero CIDs in ecred_conn_req

Fix missing 0x0000 CIDs in response for ecred_conn_req. Previously,
when one of "All connections refused" error i variable was set to 0,
thus no CIDs were copied to response.

Signed-off-by: Krzysztof Kopyściński <krzysztof.kopyscinski@codecoup.pl>