[clang] [clang-format] Do not update cursor pos if no includes replacement (PR #77456)

[Owen Pan via cfe-commits]

owenca wrote:

> The change is done 👍 Is the code formatting check broken?

See [here](https://github.com/llvm/llvm-project/pull/76059#issuecomment-1865850011).

https://github.com/llvm/llvm-project/pull/77456