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

[Owen Pan via cfe-commits]

owenca wrote:

> I have squashed the commits in only one. Note that I have left the failing tests in the commit, I am not sure if I should remove them or not.

Unfortunately, this wiped out my updates that fixed a formatting error and added `#if 0` for the failing tests.

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