Enable clang-tidy modernize-replace-auto-ptr

Official docs:

  This check replaces the uses of the deprecated class std::auto_ptr by
  std::unique_ptr (introduced in C++11). The transfer of ownership, done
  by the copy-constructor and the assignment operator, is changed to
  match std::unique_ptr usage by using explicit calls to std::move().

.clang-tidy

@@ -97,7 +97,6 @@ Checks: '*,
     -modernize-deprecated-headers,
     -modernize-deprecated-ios-base-aliases,
     -modernize-pass-by-value,
-    -modernize-replace-auto-ptr,
     -modernize-replace-disallow-copy-and-assign-macro,
     -modernize-return-braced-init-list,
     -modernize-use-auto,