Since vulkan.hpp was updated to do this for us, we should stop
outputting this number while in debug mode.

Bug: b/170962162
Change-Id: I1d813d69db4a73c71383fc54bc129e2768d5be60
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/50309
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Sean Risser <srisser@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>