[clang] [clang-tools-extra] [clang] NFCI: use TemplateArgumentLoc for NTTP DefaultArgument (PR #92852)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

@erichkeane this is kind of the same as https://github.com/llvm/llvm-project/pull/92854, but for NTTP instead of type-parameters.

https://github.com/llvm/llvm-project/pull/92852