build: update btcwallet dependency to include initial sync improvements

[wpaulino]

Depends on btcsuite/btcwallet#618.

Since we'll no longer fetch blocks headers for the whole chain, but only for the latest 10,000 blocks,
this somewhat addresses #1528 and #1545.

Fixes #1854.
Fixes #3166.

[hsjoberg]

Regarding #3166, can confirm that this seems to fix closing-down problems I've been having running lnd+neutrino on Android.

[Roasbeef]

Needs a rebase now that the dependent PR is in!

[halseth]

LGTM ✅

[cfromknecht]

Don't thinkk this related?

=== RUN   TestInterfaces/neutrino_catch_up_client_on_historical_block_epoch_ntfns
No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

[wpaulino]

Don’t think so either, have seen it before in builds for other PRs.

[cfromknecht]

Same here, tho it does seem recent

[cfromknecht]

LGTM 🔱