Modernise code to use std::make_unique

Generated by clang-tidy.

Test: m checkbuild
Change-Id: Idb24960d9326c0d94ab5d04b18deb0894d23da9f
diff --git a/cmdline/token_range.h b/cmdline/token_range.h
index 642bb1d..e28ead9 100644
--- a/cmdline/token_range.h
+++ b/cmdline/token_range.h
@@ -325,7 +325,7 @@
     string_idx += remaining;
     maybe_push_wildcard_token();
 
-    return std::unique_ptr<TokenRange>(new TokenRange(std::move(new_token_list)));
+    return std::make_unique<TokenRange>(std::move(new_token_list));
   }
 
   // Do a quick match token-by-token, and see if they match.