loader: Increase error message length
loader: Increase error message length

120 chars in error message is very conservative as error prefix and LVL
pathname alone are near 100 chars. This can easily cause layer path to get
cut off which makes for a confusing error message. Bumping this to 164
chars to account for most reasonable layer names.

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,elongbug/Vulkan-LoaderAndValidationLayers,elongbug/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,elongbug/Vulkan-LoaderAndValidationLayers,elongbug/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers