[clang] [Clang][NFCI] Prefer non-canonical template arguments for synthesized CTAD guides (PR #99840)

[Keith Smiley via cfe-commits]

keith wrote:

FYI this change broke a test that wasn't actually running, I made the test run but disabled the broken case here https://github.com/llvm/llvm-project/pull/99907

https://github.com/llvm/llvm-project/pull/99840