fixup! hle: kernel: Migrate more of KThread to KAutoObject.

src/core/hle/kernel/slab_helpers.h

@@ -74,13 +74,6 @@ private:
         kernel.SlabHeap<Derived>().Free(obj);
     }
 
-public:
-    class ListAccessor : public KAutoObjectWithListContainer::ListAccessor {
-    public:
-        ListAccessor() : KAutoObjectWithListContainer::ListAccessor(kernel.ObjectListContainer()) {}
-        ~ListAccessor() = default;
-    };
-
 public:
     KAutoObjectWithSlabHeapAndContainer(KernelCore& kernel_) : Base(kernel_), kernel(kernel_) {}
     virtual ~KAutoObjectWithSlabHeapAndContainer() {}