Allow $x, as well as $(x), at top level in TH

Allow $x, as well as $(x), at top level in TH

Bulat pointed out that in Template Haskell
   $x
is allowed instead of
   $(x)
in expressions, but not at the top level of modules.

This commit fixes the omission.  Now you can say

	f x = x
 	$h
	data T = T

and the $h will run Template Haskell just as you'd expect.