Remove unused macro_use

Found by Clippy, we don't need this `macro_use` statement.

src/lib.rs

@@ -225,7 +225,6 @@ extern crate async_trait;
 extern crate bdk_macros;
 
 #[cfg(feature = "compact_filters")]
-#[macro_use]
 extern crate lazy_static;
 
 #[cfg(feature = "electrum")]