[clang-tools-extra] [clang-tidy] Enable `modernize-return-braced-init-list`'s tests in C++11 (PR #158196)

[Carlos Galvez via cfe-commits]

https://github.com/carlosgalvezp commented:

The change will make it test only in C++17, won't it? Don't we want c++11-or-later instead?

https://github.com/llvm/llvm-project/pull/158196