Add a header-args inheritance test

Author: kaushalmodi

tests/global_tangle/header_arg_inheritance.el

@@ -0,0 +1 @@
+(message "this will be tangled")

tests/global_tangle/header_arg_inheritance.org

@@ -0,0 +1,9 @@
+#+property: header-args :tangle yes
+
+#+begin_src emacs-lisp :tangle no
+(message "this will not be tangled")
+#+end_src
+
+#+begin_src emacs-lisp
+(message "this will be tangled")
+#+end_src