Scan for the next 1000 addresses

1000 is a number chosen at random that will hopefully get us through
this until the upstream bug is fixed. We should revert this to `None` as
soon as BDK handles this case gracefully.

Fixes #965.

Seems to be an upstream bug: bitcoindevkit/bdk#521.

daemon/src/wallet.rs

@@ -115,7 +115,7 @@ impl Actor {
 
     fn sync_internal(&mut self) -> Result<WalletInfo> {
         self.wallet
-            .sync(NoopProgress, None)
+            .sync(NoopProgress, Some(1000))
             .context("Failed to sync wallet")?;
 
         let balance = self.wallet.get_balance()?;