fix Element HeaderButton

Co-authored-by: Christoph Knittel <ck@cca.io>

src/Elements.res

@@ -123,7 +123,7 @@ module HeaderButton = {
  }
 
  @module("@react-navigation/elements")
- external make: React.component<props> = "HeaderTitle"
+ external make: React.component<props> = "HeaderButton"
 }
 
 module HeaderBackButton = {