[clang-tools-extra] readability-identifier-naming should add universal default options (PR #171686)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang-tools-extra/test/clang-tidy/checkers/readability/identifier-naming-default-lower.cpp clang-tools-extra/test/clang-tidy/checkers/readability/identifier-naming-default-none.cpp clang-tools-extra/test/clang-tidy/checkers/readability/identifier-naming-default-override.cpp clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.h --diff_from_common_commit
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``````````diff
diff --git a/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp b/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp
index 3f65fb362..189bfe49d 100644
--- a/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp
+++ b/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.cpp
@@ -1587,4 +1587,3 @@ StyleKind IdentifierNamingCheck::undefinedStyle(
 
 } // namespace readability
 } // namespace clang::tidy
-
diff --git a/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.h b/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.h
index cc0533326..87735808d 100644
--- a/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.h
+++ b/clang-tools-extra/clang-tidy/readability/IdentifierNamingCheck.h
@@ -244,4 +244,3 @@ struct OptionEnumMapping<readability::IdentifierNamingCheck::CaseType> {
 } // namespace clang::tidy
 
 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_IDENTIFIERNAMINGCHECK_H
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https://github.com/llvm/llvm-project/pull/171686