loader: Make instance version report patch version

The loader previously reported only major/minor version in
vkEnumerateInstanceVersion. This makes it report the patch version
as well.

Change-Id: Ieaafc5ebf331074ace90f928da16562e5ad0d637
diff --git a/loader/loader.c b/loader/loader.c
index 6b69e3a..c5082bc 100644
--- a/loader/loader.c
+++ b/loader/loader.c
@@ -7101,7 +7101,7 @@
 terminator_EnumerateInstanceVersion(const VkEnumerateInstanceVersionChain *chain, uint32_t* pApiVersion) {
     // NOTE: The Vulkan WG doesn't want us checking pApiVersion for NULL, but instead
     // prefers us crashing.
-    *pApiVersion = VK_MAKE_VERSION(loader_major_version, loader_minor_version, 0);
+    *pApiVersion = VK_MAKE_VERSION(loader_major_version, loader_minor_version, VK_HEADER_VERSION);
     return VK_SUCCESS;
 }