Remove `syncing` wallet log

BDK already has a log line for the sync that we could enable if we
wanted such a log.
Additionally, _we_ are not actually syncing the wallet, bdk is so our
log line was lying. It should have said "calling bdk to sync wallet".

swap/src/bitcoin/wallet.rs

@@ -111,7 +111,6 @@ impl Wallet {
     }
 
     pub async fn sync_wallet(&self) -> Result<()> {
-        tracing::debug!("syncing wallet");
         self.inner.lock().await.sync(noop_progress(), None)?;
         Ok(())
     }

swap/src/trace.rs

@@ -16,7 +16,7 @@ pub fn init_tracing(level: LevelFilter) -> Result<()> {
     let subscriber = FmtSubscriber::builder()
         .with_env_filter(format!(
             "swap={},monero_harness={},bitcoin_harness={},http=warn,warp=warn",
-            level, level, level,
+            level, level, level
         ))
         .with_writer(std::io::stderr)
         .with_ansi(is_terminal)