[clang] [Clang][OpenMP] Fix the wrong transform of `num_teams` claused introduced in #99732 (PR #102716)

[Shilei Tian via cfe-commits]

shiltian wrote:

* **#102716** <a href="https://app.graphite.dev/github/pr/llvm/llvm-project/102716?utm_source=stack-comment-icon" target="_blank"><img src="https://static.graphite.dev/graphite-32x32-black.png" alt="Graphite" width="10px" height="10px"/></a> 👈
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https://github.com/llvm/llvm-project/pull/102716