layers: Suppress warning generation after app acknowledges an error
layers: Suppress warning generation after app acknowledges an error

The app already knows about the problem-- it has requested that the call
be skipped. Producing another warning afterward is just noise.

Signed-off-by: Chris Forbes <c3279c50043e18e9442c1ae071cafa0e7a4ca967@google.com>

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools