[clang] [clang][dataflow][NFC] Fix code formatting in DataflowEnvironment.cpp (PR #89352)

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martinboehme wrote:

Merging without review as this is a trivial, formatting-only change that was auto-generated by clang-format, and I'd like to expeditiously fix the formatting error I made in https://github.com/llvm/llvm-project/pull/89235.

https://github.com/llvm/llvm-project/pull/89352