Fix new Rust nightly warnings (#3659)

Author: kennykerr

crates/libs/bindgen/src/derive.rs

@@ -19,7 +19,7 @@ impl Derive {
 
             let derive = derive
                 .split(',')
-                .filter(|&derive| (!derive.is_empty()))
+                .filter(|&derive| !derive.is_empty())
                 .map(|derive| derive.to_string())
                 .collect();
             map.insert(tn, derive);