[clang-tools-extra] [clang-tidy] Avoid expensive AST traversal in RedundantTypenameCheck (PR #170540)

[Yanzuo Liu via cfe-commits]

zwuis wrote:

```diff
-traverse(TK_IgnoreUnlessSpelledInSource, Matcher)
+Matcher
```

Adding this `traverse` is NFC after #170953.

https://github.com/llvm/llvm-project/pull/170540