core: hle: kernel: Downgrade dangling objects warning to debug.

- It is not impossible to leak kernel objects, so this is not really any issue anymore (albeit, still interesting).

src/core/hle/kernel/kernel.cpp

@@ -182,7 +182,7 @@ struct KernelCore::Impl {
         {
             std::lock_guard lk(registered_objects_lock);
             if (registered_objects.size()) {
-                LOG_WARNING(Kernel, "{} kernel objects were dangling on shutdown!",
+                LOG_DEBUG(Kernel, "{} kernel objects were dangling on shutdown!",
                           registered_objects.size());
                 registered_objects.clear();
             }