fix spacing in for snippet

I had added the extra spacing as a work-around for a bug in UltiSnips
which turns out to be a result of a Vim option I had set to a
non-default value.  It's still a bug in UltiSnips, but most people will
not be affected and my work-around will do more harm than good.

Author: dag

UltiSnips/fish.snippets

@@ -40,7 +40,7 @@ case '*'
 endsnippet
 
 snippet for "For loop" b
-for ${1:var}  in ${2:values}
+for ${1:var} in ${2:values}
 	$3
 end
 endsnippet