Fix typo leading to module compilation error

[YaaZ]

This typo breaks module compilation. Unfortunately, it already got into Vulkan-Headers 1.4.333. If you are interested, take a look at the CI I set up to test the modules - it works with MSVC on Windows and LLVM/Clang+libc on Linux & macOS.

[sharadhr]

The CI setup is really nice; maybe we can use it almost-wholesale.

More importantly, we should find a way to parametrise even the hardcoded stuff; having typos like this making it into point releases is a bit of an issue.