Fixes test on Windows. Same reason as https://github.com/llvm/llvm-project/pull/149322
Deeply nested structs can be noisy, so Apple's LLDB fork sets the default to `4`: 9c93adbb28/lldb/source/Target/TargetProperties.td (L134-L136) Thought it would be useful to upstream this. Though happy to pick a different default or keep it as-is.
9c93adbb28/lldb/source/Target/TargetProperties.td (L134-L136)