Fix renamed clippy lint (#1777)

exercises/practice/binary-search/tests/binary-search.rs

@@ -3,7 +3,7 @@
 // the borrows become needless. Since we want the tests to work
 // without clippy warnings for both people who take on the
 // additional challenge and people who don't, we disable this lint.
-#![allow(clippy::needless_borrow)]
+#![allow(clippy::needless_borrows_for_generic_args)]
 
 use binary_search::find;