[flow] Do not special case ref prop for non-component-type in jsx

Summary:
The effect is a few removed errors, since it will just make props, which now includes the ref prop, flow to any since prop types of a non-component is any.

Changelog: [internal]

Reviewed By: panagosg7

Differential Revision: D65694569

fbshipit-source-id: 60a1b5f904e6a722e9f5ae3810654b58ffae1b36

src/typing/react_kit.ml

@@ -255,8 +255,7 @@ module Kit (Flow : Flow_common.S) : REACT = struct
       | Options.ReactRefAsProp.PartialSupport -> None)
     | DefT (_, ReactAbstractComponentT { instance = ComponentInstanceOmitted _; _ })
     | DefT (_, StrT _)
-    | DefT (_, SingletonStrT _)
-    | _ ->
+    | DefT (_, SingletonStrT _) ->
       get_builtin_typeapp
         cx
         (update_desc_new_reason (fun desc -> RTypeAppImplicit desc) reason_ref)
@@ -269,6 +268,7 @@ module Kit (Flow : Flow_common.S) : REACT = struct
             );
         ]
       |> Option.some
+    | _ -> None
 
   let rec props_to_tout cx trace component ~use_op ~reason_op u tout =
     match drop_generic component with