gluon-client-bridge: reenable multicast snooping for client zone
LEDE recently disabled multicast snooping by default:
https://git.lede-project.org/?p=project/netifd.git;a=commitdiff;h=52541140f8138e31958cdc3d7e42a4029fa6bbc9
Reenable it for Gluon as there have been no confirmed issues for
LEDE and no negative reports concerning Gluon v2016.2.x so far.
Closes #1025.
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>