`VK_INSTANCE_LAYERS` log messages don't interact when with `vk_loader_settings.json` `layers` section

`VK_INSTANCE_LAYERS` allows enabling and ordering the layers, including implicit and explicit layers.

This is working fine when the `layers` section of `vk_loader_settings.json` is not written.

If `layers` is written but remains empty, `VK_INSTANCE_LAYERS` is ignored and not layers are executed as expected.

However, the Vulkan Loader log messages when enabling only `LAYERS` messages are a bit confusing (`VK_INSTANCE_LAYERS` is correctly ignored but the warnings says the layers are added):
```
Launching Vulkan Application:
- Executable: E:\VulkanSDK\1.4.335.0-rc\Bin\vkcube.exe
- Working Directory: E:\VulkanSDK\1.4.335.0-beta1\Bin
- Command-line Arguments:
- --suppress_popups
- Environment Variables:
- VK_INSTANCE_LAYERS=VK_LAYER_KHRONOS_profiles;VK_LAYER_KHRONOS_validation;VK_LAYER_NV_optimus
- Log file: C:\Users\Piranha\VulkanSDK\vkcube.txt

Selected WSI platform: win32

[Vulkan Loader] WARNING | LAYER: env var 'VK_INSTANCE_LAYERS' defined and adding layers: VK_LAYER_KHRONOS_profiles;VK_LAYER_KHRONOS_validation;VK_LAYER_NV_optimus

[Vulkan Loader] WARNING | LAYER: env var 'VK_INSTANCE_LAYERS' defined and adding layers: VK_LAYER_KHRONOS_profiles;VK_LAYER_KHRONOS_validation;VK_LAYER_NV_optimus
[Vulkan Loader] LAYER: vkCreateInstance layer callstack setup to:
[Vulkan Loader] LAYER:
[Vulkan Loader] LAYER: ||
[Vulkan Loader] LAYER:
[Vulkan Loader] LAYER: ||
[Vulkan Loader] LAYER:

Selected GPU 0: NVIDIA GeForce RTX 3080 Ti, type: DiscreteGpu
[Vulkan Loader] DRIVER: vkCreateDevice layer callstack setup to:
[Vulkan Loader] DRIVER:
[Vulkan Loader] DRIVER: ||
[Vulkan Loader] DRIVER:
[Vulkan Loader] DRIVER: ||
[Vulkan Loader] DRIVER:
[Vulkan Loader] DRIVER: Using "NVIDIA GeForce RTX 3080 Ti" with driver: "C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_20ae8f14a487d5db\nvoglv64.dll"
```