ResourceLoader: Fixup resource changed feature (no. 2)

(cherry picked from commit 6b3e009)

core/io/resource_loader.cpp

@@ -862,7 +862,7 @@ Ref<Resource> ResourceLoader::_load_complete_inner(LoadToken &p_load_token, Erro
 						}
 					}
 					core_bind::Semaphore done;
-					MessageQueue::get_main_singleton()->push_callable(callable_mp(&done, &core_bind::Semaphore::post));
+					MessageQueue::get_main_singleton()->push_callable(callable_mp(&done, &core_bind::Semaphore::post).bind(1));
 					done.wait();
 				}
 			}