Remove dead code flagged by lint

Author: sanxiyn

src/libtest/lib.rs

@@ -118,6 +118,7 @@ impl fmt::Display for TestName {
 #[derive(Clone, Copy)]
 enum NamePadding {
     PadNone,
+    #[allow(dead_code)]
     PadOnLeft,
     PadOnRight,
 }