[clang] [clang-format] Reset `Line->IsModuleOrImportDecl` in `addUnwrappedLine` (PR #204565)

[Björn Schäpers via cfe-commits]

HazardyKnusperkeks wrote:

That seems logical, but do you have an example, that can be added as a test?

https://github.com/llvm/llvm-project/pull/204565