Revert "tests: used_underscore_binding_macro: disable random_state lint."

This reverts commit 2b80829.

Author: matthiaskrgr

tests/run-pass/used_underscore_binding_macro.rs

@@ -8,7 +8,6 @@
 // except according to those terms.
 
 #![allow(clippy::useless_attribute)] //issue #2910
-#![allow(clippy::random_state)] // issue #3628
 
 #[macro_use]
 extern crate serde_derive;