fix typo to make Vector es6-iterable

Author: swannodette

src/main/cljs/cljs/core.cljs

@@ -12477,7 +12477,7 @@ reduces them without incurring seq initialization"
   IPrintWithWriter
   (-pr-writer [coll writer opts] (pr-sequential-writer writer pr-writer "[" " " "]" opts coll)))
 
-(es6-iterable PersistentVector)
+(es6-iterable Vector)
 
 (set! (. Vector -EMPTY) (Vector. nil (array) nil))