Fix ThreadedRef::create(PyObject*) returning Ref instead of ThreadedRef

Summary:
The template overload for non-PyObject types incorrectly returned
Ref(...) instead of ThreadedRef(...). Since ThreadedRef has no
implicit conversion from Ref and its copy constructor is deleted,
this would fail to compile on first instantiation.

Reviewed By: jbower-fb

Differential Revision: D94927229

fbshipit-source-id: 06792d9811834c4e827db96f1c6d7c6f5930c26d

Author: alexmalyshev

cinderx/Jit/threaded_compile.h

@@ -282,7 +282,7 @@ class ThreadedRef : public RefBase<T> {
   template <typename X = T>
     requires(!IsPyObject<X>)
   static ThreadedRef create(PyObject* obj) {
-    return Ref(reinterpret_cast<T*>(obj));
+    return ThreadedRef(reinterpret_cast<T*>(obj));
   }
 
  private: