bridge: Fix controller status update to passive connections

bridge: Fix controller status update to passive connections

The bug can cause ovs-vswitchd to crash (due to assert) when it is
set up with a passive controller connection. Since only active
connections are kept, the passive connection status update should be
ignored and not trigger asserts.

Fixes: 85c55772a453 ("bridge: Fix controller status update")
Reported-by: Josh Bailey <josh@faucet.nz>
Signed-off-by: Andy Zhou <azhou@ovn.org>
Acked-by: Joe Stringer <joe@ovn.org>