Update comment test

PostCSS 6 gets the whitespace here correctly now

Author: jonathantneal

test/fixtures/comment.output.css

@@ -1,10 +1,10 @@
-@media screen and  (min-width: 500px)  and (max-width: 1200px)/* comment */ {
+@media screen and  (min-width: 500px)  and (max-width: 1200px) /* comment */{
   .bar {
     display: block;
   }
 }
 
-@media screen and (min-width: 500px) and (max-width: 1200px)/* comment */ {
+@media screen and (min-width: 500px) and (max-width: 1200px) /* comment */{
   .bar {
     display: block;
   }