Fixes Vulkan Validation Layer name. VK_LAYER_LUNARG_standard_validation was deprecated and replaced by VK_LAYER_KHRONOS_validation. The deprecated name was removed from Khronos github entirely in Feb 2020. (https://github.com/KhronosGroup/Vulkan-ValidationLayers/pull/1562)
Fixes Vulkan Validation Layer name. VK_LAYER_LUNARG_standard_validation was deprecated and replaced by VK_LAYER_KHRONOS_validation. The deprecated name was removed from Khronos github entirely in Feb 2020. (https://github.com/KhronosGroup/Vulkan-ValidationLayers/pull/1562)