lualoader: correct a typo from r354247

r354247 converted try_include to lfs + dofile with the loader.lua_path added
just before. Fortunately, there was a hardcoded /boot/lua fallback in case
loader.lua_path wasn't being set yet- I typo'd it as loader.lua_paths.

Fix the typo.

X-MFC-With:	r354247
MFC after:	3 days

stand/lua/core.lua

@@ -70,7 +70,7 @@ end
 -- message on failure.
 function try_include(module)
 	if module:sub(1, 1) ~= "/" then
-		local lua_path = loader.lua_paths
+		local lua_path = loader.lua_path
 		-- XXX Temporary compat shim; this should be removed once the
 		-- loader.lua_path export has sufficiently spread.
 		if lua_path == nil then