Save wallet to disk at creation

src/main.rs

@@ -385,6 +385,8 @@ async fn main() -> Result<()> {
         })
         .expect("Failed to initialize WALLET");
 
+    WALLET.get().unwrap().save().unwrap();
+
     if last_scan < current_tip {
         log::info!("Scanning for our outputs");
         scan_blocks(current_tip - last_scan, &config.electrum_url)?;