vulkaninfo: fix nesting of HTML output
vulkaninfo: fix nesting of HTML output

Four extensions, if supported on a device, didn't emit the proper "</details>"
closing tag.  This caused the nesting to be incorrect while viewing the HTML output.

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