[clang] [Clang][Sema] Use the correct injected template arguments for partial specializations when collecting multi-level template argument lists (PR #112381)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

Change itself seems reasonable, so approve, pending a good couple of tests.

https://github.com/llvm/llvm-project/pull/112381