htlcswitch: increase batch counter for exit hop settle and fail
htlcswitch: increase batch counter for exit hop settle and fail

The idea of the batch counter is to increase it for commit tx updates,
so that if the commit tx cannot be updated immediately (revocation
window exhausted), the batch ticker makes sure it happens later.

The batch counter was increased for forwarded htlcs, but not for exit hop
resolutions.

This lead to the situation where the commitment tx would not be updated,
even though the htlc was settled locally. When no other changes happen
on the channel, the htlc eventually reaches its expiry and the channel
is force closed.

aakselrod/lnd,aakselrod/lnd,LightningNetwork/lnd,LightningNetwork/lnd