layers: Fix segv during DebugReportCallback setup
layers: Fix segv during DebugReportCallback setup

Change debug log message to use correct VkObjectType to
VkDebugReportObjectTypeEXT method, avoiding the index out-of-bounds
lookup that caused a SEGV.

Change-Id: Ibb6e485eccb36ff0e9b49f0722d8f2d0bf660982

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