be2net: fix multicast filter programming

 Re-posting with subject fixed!

 Multicast programming has been broken since commit 5b8821b7

. Setting the
 MULTICAST flag while sending the cmd to the FW was missing. Fixed this.

Also fixed-up some indentation in the adjacent lines.

Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>