Fix typo in Value's constructor with a Symbol

Summary:
The current JSI implementation is converting a Symbol to String when creating a jsi Value.

Changelog: [General][Fixed]

Reviewed By: neildhar

Differential Revision: D35705825

fbshipit-source-id: 3bee0a02bb77643c6a33031b4d98ac9a7e126303

ReactCommon/jsi/jsi/jsi.h

@@ -992,7 +992,7 @@ class JSI_EXPORT Value {
 
   /// Copies a Symbol lvalue into a new JS value.
   Value(Runtime& runtime, const Symbol& sym) : Value(SymbolKind) {
-    new (&data_.pointer) String(runtime.cloneSymbol(sym.ptr_));
+    new (&data_.pointer) Symbol(runtime.cloneSymbol(sym.ptr_));
   }
 
   /// Copies a String lvalue into a new JS value.