Remove unneeded reference

clippy emits:

 warning: this expression creates a reference which is immediately
 dereferenced by the compiler

As suggested, remove the explicit reference.

src/blockdata/script.rs

@@ -1085,7 +1085,7 @@ impl serde::Serialize for Script {
         if serializer.is_human_readable() {
             serializer.serialize_str(&format!("{:x}", self))
         } else {
-            serializer.serialize_bytes(&self.as_bytes())
+            serializer.serialize_bytes(self.as_bytes())
         }
     }
 }