[Lua] Generated lua does not use "file_identifier"

[qsrenniks]

Using this as an example fbs file: MyTest.fbs

table MyTest
{
	test_float:float;
}

root_type MyTest;
file_identifier "mtst";

Running flatc --lua MyTest.fbs generates lua code that does not provide functions for correctly building a binary that embeds that file_identifier in it for use as a file type.