[clang] [clang][Sema] Fix assertion on invalid template template parameter during typo correction (PR #188239)

[Matheus Izvekov via cfe-commits]

https://github.com/mizvekov commented:

The fix looks good, but maybe we should move this filtering into the TypoCorrection implementation itself, since this repeats what's done elsewhere? See https://github.com/llvm/llvm-project/pull/181239

https://github.com/llvm/llvm-project/pull/188239