Tablets: Remove #![allow(dead_code)]

The code is now used, so it's no longer necessary to prevent warnings.

scylla/src/transport/locator/tablets.rs

@@ -1,4 +1,3 @@
-#![allow(dead_code)]
 use itertools::Itertools;
 use lazy_static::lazy_static;
 use scylla_cql::cql_to_rust::FromCqlVal;