[clang-tools-extra] [clang-tidy][NFC] Do less unnecessary work in `NoLintDirectiveHandler` (PR #147553)

[Carlos Galvez via cfe-commits]

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@@ -31,8 +31,6 @@ class NoLintDirectiveHandler {
 public:
   NoLintDirectiveHandler();
   ~NoLintDirectiveHandler();
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carlosgalvezp wrote:

> It's = default; anyway.

Then it should just be removed? Rule of 0.

https://github.com/llvm/llvm-project/pull/147553