rendervulkan: Enable VK_KHR_image_format_list if we use modifiers

This extension is required for whatever reason. Validation complains about it.

Signed-off-by: Joshua Ashton <joshua@froggi.es>

src/rendervulkan.cpp

@@ -968,6 +968,7 @@ retry:
 	if ( g_vulkanSupportsModifiers )
 	{
 		vecEnabledDeviceExtensions.push_back( VK_EXT_IMAGE_DRM_FORMAT_MODIFIER_EXTENSION_NAME );
+		vecEnabledDeviceExtensions.push_back( VK_KHR_IMAGE_FORMAT_LIST_EXTENSION_NAME ); // Required.
 	}
 
 	vecEnabledDeviceExtensions.push_back( VK_KHR_EXTERNAL_MEMORY_FD_EXTENSION_NAME );