fix more indenting

Author: Johan Wiltink

tests/prime-sieve/solution.txt

@@ -15,7 +15,7 @@ S  = \ f g x . f x (g x)
 T  = \ x f . f x
 V  = \ x y f . f x y
 W  = \ f x . f x x
-Y = \ f . ( \ x . f (x x) ) ( \ x . f (x x) )
+Y  = \ f . ( \ x . f (x x) ) ( \ x . f (x x) )
 Z  = \ f . ( \ x . f \ y . x x y ) ( \ x . f \ y . x x y )
 
 #import Ordering.lc