[clang] [clang][ASTImporter] Fix import of SubstTemplateTypeParmType in return type of function. (PR #69724)

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=?utf-8?q?Bal=C3=A1zs_K=C3=A9ri?= <balazs.keri at ericsson.com>
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https://github.com/DonatNagyE approved this pull request.

LGTM, congratulations for catching this corner case!

https://github.com/llvm/llvm-project/pull/69724