layers: Get rid of 1K limit on debug message length
layers: Get rid of 1K limit on debug message length

Change-Id: I00246f3edd26078d634a8bd1f65755cafcc6467b

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