[clang-tools-extra] [clang-tidy] Fix virtual inheritance FP in misc-multiple-inheritance (PR #186103)

[Baranov Victor via cfe-commits]

vbvictor wrote:

> I think they are unlikely to be affected by this commit since they already banned Virtual inheritance (which is everything this PR is trying to improve). For cases without virtual inheritance, the behavior is unchanged. Also if they rely on the Fuchsia checks, finding virtual inheritance is already covered by [fuchsia-virtual-inheritance](https://clang.llvm.org/extra/clang-tidy/checks/fuchsia/virtual-inheritance.html).

Thank you for pointing out `fuchsia-virtual-inheritance`, yes it doesn't make sense to do any options here. Thank you for explanation!

https://github.com/llvm/llvm-project/pull/186103