Define ENABLE_VK_DEBUGGER to 1 so that VS code doesn't gray-out the debugger logic.
This does not affect the build in any way.

Bug: b/145351270
Change-Id: I52e1dfa7c2d83f2db4258d6e9e5f3a57c601452d
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40089
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>